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|
Fifo overflow in transfer_fifo()
Description of problem:
In transfer_fifo(), fifo32_push() fails since less than 32 bytes are free in the
fifo.
Steps to reproduce:
```
export QEMU=/path/to/qemu-system-aarch64
cat << EOF | $QEMU \
-machine xlnx-zcu102 -monitor none -serial none \
-display none -nodefaults -qtest stdio
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x554439e4
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x7439dad1
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x554439e4
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x7439dad1
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070030 0x5b33c2da
writel 0xff070004 0x6847773b
writel 0xff070030 0x5b33c2da
writel 0xff070000 0x7a9e77fa
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x0bbac0b1
readl 0xff070054
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
writel 0xff070038 0x3730c1d8
writel 0xff07003c 0x1f9c3bcd
EOF
```
Additional information:
```
==60953==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
INFO: found LLVMFuzzerCustomMutator (0x55c4943a85f0). Disabling -len_control by default.
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 1771329340
INFO: Loaded 1 modules (600781 inline 8-bit counters): 600781 [0x55c4979bb000, 0x55c497a4dacd),
INFO: Loaded 1 PC tables (600781 PCs): 600781 [0x55c49708fbf0,0x55c4979ba8c0),
./qemu-videzzo-aarch64-target-videzzo-fuzz-xlnx-zynqmp-can: Running 1 inputs 1 time(s) each.
INFO: Reading pre_seed_input if any ...
INFO: Executing pre_seed_input if any ...
Matching objects by name , *xlnx.zynqmp-can*
This process will fuzz the following MemoryRegions:
* xlnx.zynqmp-can[1] (size 84)
* xlnx.zynqmp-can[0] (size 84)
* xlnx.zynqmp-can[1] (size 84)
* xlnx.zynqmp-can[0] (size 84)
This process will fuzz through the following interfaces:
* clock_step, EVENT_TYPE_CLOCK_STEP, 0xffffffff +0xffffffff, 255,255
* xlnx.zynqmp-can, EVENT_TYPE_MMIO_READ, 0xff070000 +0x84, 4,4
* xlnx.zynqmp-can, EVENT_TYPE_MMIO_WRITE, 0xff070000 +0x84, 4,4
* xlnx.zynqmp-can, EVENT_TYPE_MMIO_READ, 0xff060000 +0x84, 4,4
* xlnx.zynqmp-can, EVENT_TYPE_MMIO_WRITE, 0xff060000 +0x84, 4,4
INFO: A corpus is not provided, starting from an empty corpus
#2 INITED cov: 3 ft: 4 corp: 1/1b exec/s: 0 rss: 509Mb
Running: poc-qemu-videzzo-aarch64-target-videzzo-fuzz-xlnx-zynqmp-can-crash-8c83f08fb7643e6eb55af43e76de522c6f5fcef2.minimized.minimized
qemu-videzzo-aarch64-target-videzzo-fuzz-xlnx-zynqmp-can: ../util/fifo8.c:34: void fifo8_push(Fifo8 *, uint8_t): Assertion `fifo->num < fifo->capacity' failed.
==60953== ERROR: libFuzzer: deadly signal
#0 0x55c48f86e0fe in __sanitizer_print_stack_trace /root/llvm-project/compiler-rt/lib/asan/asan_stack.cpp:86:3
#1 0x55c48f7bcd71 in fuzzer::PrintStackTrace() /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerUtil.cpp:210:38
#2 0x55c48f795ca6 in fuzzer::Fuzzer::CrashCallback() (.part.0) /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:236:18
#3 0x55c48f795d72 in fuzzer::Fuzzer::CrashCallback() /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:208:1
#4 0x55c48f795d72 in fuzzer::Fuzzer::StaticCrashSignalCallback() /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:207:19
#5 0x7fe36599541f (/lib/x86_64-linux-gnu/libpthread.so.0+0x1441f)
#6 0x7fe3657a700a in __libc_signal_restore_set /build/glibc-SzIz7B/glibc-2.31/signal/../sysdeps/unix/sysv/linux/internal-signals.h:86:3
#7 0x7fe3657a700a in raise /build/glibc-SzIz7B/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:48:3
#8 0x7fe365786858 in abort /build/glibc-SzIz7B/glibc-2.31/stdlib/abort.c:79:7
#9 0x7fe365786728 in __assert_fail_base /build/glibc-SzIz7B/glibc-2.31/assert/assert.c:92:3
#10 0x7fe365797fd5 in __assert_fail /build/glibc-SzIz7B/glibc-2.31/assert/assert.c:101:3
#11 0x55c4941f98ef in fifo8_push /root/videzzo/videzzo_qemu/qemu/out-san/../util/fifo8.c:34:5
#12 0x55c490d83bb0 in fifo32_push /root/videzzo/videzzo_qemu/qemu/include/qemu/fifo32.h:94:9
#13 0x55c490d79d17 in transfer_fifo /root/videzzo/videzzo_qemu/qemu/out-san/../hw/net/can/xlnx-zynqmp-can.c:476:21
#14 0x55c490d71a00 in can_tx_post_write /root/videzzo/videzzo_qemu/qemu/out-san/../hw/net/can/xlnx-zynqmp-can.c:836:9
#15 0x55c48fdfaf9b in register_write /root/videzzo/videzzo_qemu/qemu/out-san/../hw/core/register.c:122:9
#16 0x55c48fdfefb8 in register_write_memory /root/videzzo/videzzo_qemu/qemu/out-san/../hw/core/register.c:203:5
#17 0x55c4934be1d3 in memory_region_write_accessor /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/memory.c:493:5
#18 0x55c4934bdb11 in access_with_adjusted_size /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/memory.c:555:18
#19 0x55c4934bc436 in memory_region_dispatch_write /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/memory.c:1515:16
#20 0x55c49354cd0e in flatview_write_continue /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/physmem.c:2825:23
#21 0x55c49353aabb in flatview_write /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/physmem.c:2867:12
#22 0x55c49353a578 in address_space_write /root/videzzo/videzzo_qemu/qemu/out-san/../softmmu/physmem.c:2963:18
#23 0x55c48f8aed48 in qemu_writel /root/videzzo/videzzo_qemu/qemu/out-san/../tests/qtest/videzzo/videzzo_qemu.c:1096:5
#24 0x55c48f8ad0b3 in dispatch_mmio_write /root/videzzo/videzzo_qemu/qemu/out-san/../tests/qtest/videzzo/videzzo_qemu.c:1245:28
#25 0x55c4943a3a6f in videzzo_dispatch_event /root/videzzo/videzzo.c:1140:5
#26 0x55c49439aded in __videzzo_execute_one_input /root/videzzo/videzzo.c:288:9
#27 0x55c49439ab94 in videzzo_execute_one_input /root/videzzo/videzzo.c:329:9
#28 0x55c48f8b608c in videzzo_qemu /root/videzzo/videzzo_qemu/qemu/out-san/../tests/qtest/videzzo/videzzo_qemu.c:1520:12
#29 0x55c4943a88bb in LLVMFuzzerTestOneInput /root/videzzo/videzzo.c:1910:18
#30 0x55c48f796816 in fuzzer::Fuzzer::ExecuteCallback(unsigned char*, unsigned long) /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:594:17
#31 0x55c48f779444 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:21
#32 0x55c48f7843ee in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char*, unsigned long)) /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:885:19
#33 0x55c48f7709d6 in main /root/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:30
#34 0x7fe365788082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
#35 0x55c48f770a2d in _start (/root/bugs/metadata/xlnx_zynqmp_can-01/qemu-videzzo-aarch64-target-videzzo-fuzz-xlnx-zynqmp-can+0x3454a2d)
NOTE: libFuzzer has rudimentary signal handlers.
Combine libFuzzer with AddressSanitizer or similar for better crash reports.
SUMMARY: libFuzzer: deadly signal
MS: 0 ; base unit: 0000000000000000000000000000000000000000
```
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