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[sanitizer] Fix Fuchsia ReadBinaryName not to crash when uninitialized 

If the sanitizer runtime is loaded in a binary that doesn't really
support it, then __sanitizer_startup_hook will never have been
called to initialize StoredArgv. This case can't be supported, but
its failure mode shouldn't be to crash in sanitizer_common internals.

Patch By: mcgrathr

Differential Revision: https://reviews.llvm.org/D46344

llvm-svn: 331382
This commit is contained in:
Petr Hosek 2018-05-02 18:08:47 +00:00
parent 8d0d1aa229
commit 716d9949f6
1 changed files with 4 additions and 2 deletions
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6
compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cc
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@ -431,8 +431,10 @@ const char *GetEnv(const char *name) {
}
uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
const char *argv0 = StoredArgv[0];
if (!argv0) argv0 = "<UNKNOWN>";
const char *argv0 = "<UNKNOWN>";
if (StoredArgv && StoredArgv[0]) {
argv0 = StoredArgv[0];
}
internal_strncpy(buf, argv0, buf_len);
return internal_strlen(buf);
}