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double-free in vmdk_add_extent()
Description of problem:
A double-free issue in the VMDK driver occurs when handling snapshots.
The memory allocated for extent structures is freed twice: first in
vmdk_close (block/vmdk.c) and then in vmdk_add_extent (block/vmdk.c).
Steps to reproduce:
1. [test.raw](/uploads/deeb9dc3cab1916adadd211173cd175a/test.raw)
2. ./qemu-img snapshot -q -a test test.raw
Additional information:
<details>
<pre>
./qemu-img snapshot -q -a test test.raw
==18180==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
=================================================================
==18180==ERROR: AddressSanitizer: attempting double-free on 0x612000011bc0 in thread T0:
#0 0x5605ba505168 in realloc /usr/src/RPM/BUILD/llvm-11.0.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x7f22be5fd6b7 in g_realloc (/lib64/libglib-2.0.so.0+0x5c6b7)
#2 0x5605ba866a79 in vmdk_add_extent /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:570:18
#3 0x5605ba86122e in vmdk_open_vmdk4 /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1059:11
#4 0x5605ba86122e in vmdk_open_sparse /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1127:20
#5 0x5605ba85723a in vmdk_open /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1371:19
#6 0x5605ba803ca4 in bdrv_snapshot_goto /home/gerben/qemu-img_fuzz/build/../block/snapshot.c:299:20
#7 0x5605baa8cdd2 in img_snapshot /home/gerben/qemu-img_fuzz/build/../qemu-img.c:3500:15
#8 0x7f22bd559efc in __libc_start_main (/lib64/libc.so.6+0x27efc)
#9 0x5605ba4619f9 in _start /usr/src/RPM/BUILD/glibc-2.32-alt5.p10.3/csu/../sysdeps/x86_64/start.S:120
0x612000011bc0 is located 0 bytes inside of 272-byte region [0x612000011bc0,0x612000011cd0)
freed by thread T0 here:
#0 0x5605ba504aef in free /usr/src/RPM/BUILD/llvm-11.0.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:123:3
#1 0x5605ba857e6d in vmdk_close /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:2889:5
#2 0x5605ba803bb2 in bdrv_snapshot_goto /home/gerben/qemu-img_fuzz/build/../block/snapshot.c:290:13
#3 0x5605baa8cdd2 in img_snapshot /home/gerben/qemu-img_fuzz/build/../qemu-img.c:3500:15
#4 0x7f22bd559efc in __libc_start_main (/lib64/libc.so.6+0x27efc)
previously allocated by thread T0 here:
#0 0x5605ba505168 in realloc /usr/src/RPM/BUILD/llvm-11.0.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
#1 0x7f22be5fd6b7 in g_realloc (/lib64/libglib-2.0.so.0+0x5c6b7)
#2 0x5605ba86122e in vmdk_open_vmdk4 /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1059:11
#3 0x5605ba86122e in vmdk_open_sparse /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1127:20
#4 0x5605ba85723a in vmdk_open /home/gerben/qemu-img_fuzz/build/../block/vmdk.c:1371:19
#5 0x5605ba56e3a2 in bdrv_open_driver /home/gerben/qemu-img_fuzz/build/../block.c:1660:15
#6 0x5605ba57ea50 in bdrv_open_common /home/gerben/qemu-img_fuzz/build/../block.c:1985:11
#7 0x5605ba57ea50 in bdrv_open_inherit /home/gerben/qemu-img_fuzz/build/../block.c:4153:11
#8 0x5605ba585cb8 in bdrv_open /home/gerben/qemu-img_fuzz/build/../block.c:4248:12
#9 0x5605ba637d4c in blk_new_open /home/gerben/qemu-img_fuzz/build/../block/block-backend.c:457:10
#10 0x5605baa9193b in img_open_file /home/gerben/qemu-img_fuzz/build/../qemu-img.c:405:11
#11 0x5605baa9143e in img_open /home/gerben/qemu-img_fuzz/build/../qemu-img.c:450:15
#12 0x5605baa8cc71 in img_snapshot /home/gerben/qemu-img_fuzz/build/../qemu-img.c:3468:11
#13 0x7f22bd559efc in __libc_start_main (/lib64/libc.so.6+0x27efc)
SUMMARY: AddressSanitizer: double-free /usr/src/RPM/BUILD/llvm-11.0.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3 in realloc
==18180==ABORTING
</pre>
</details>
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