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Stack address is returned from function translate_one
The vulnerable version is qemu-2.8.0, and the vulnerable function is in "target-s390x/translate.c".
The code snippet is as following.
static ExitStatus translate_one(CPUS390XState *env, DisasContext *s)
{
const DisasInsn *insn;
ExitStatus ret = NO_EXIT;
DisasFields f;
...
s->fields = &f;
...
s->pc = s->next_pc;
return ret;
}
A stack address, i.e. the address of local variable "f" is returned from current function through the output parameter "s->fields" as a side effect.
This issue is one kind of undefined behaviors, according the C Standard, 6.2.4 [ISO/IEC 9899:2011] (https://www.securecoding.cert.org/confluence/display/c/DCL30-C.+Declare+objects+with+appropriate+storage+durations)
This dangerous defect may lead to an exploitable vulnerability.
We suggest sanitizing "s->fields" as null before return.
Note that this issue is reported by shqking and Zhenwei Zou together.
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