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bpo-37926: Fix PySys_SetArgvEx(0, NULL, 0) crash (GH-15415) (GH-15420)

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empty_argv is no longer static in Python 3.8, but it is declared in
a temporary scope, whereas argv keeps a reference to it.
empty_argv memory (allocated on the stack) is reused by
make_sys_argv() code which is inlined when using gcc -O3.

Define empty_argv in PySys_SetArgvEx() body, to ensure
that it remains valid for the whole lifetime of
the PySys_SetArgvEx() call.

(cherry picked from commit c48682509d)
This commit is contained in:
Victor Stinner 2019-08-23 12:22:14 +01:00 • committed by GitHub
parent 994925b2cb
commit ca9ae94a2a
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2 changed files with 3 additions and 1 deletions
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1
Misc/NEWS.d/next/C API/2019-08-23-11-35-55.bpo-37926.hnI5IQ.rst Normal file
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@ -0,0 +1 @@
Fix a crash in ``PySys_SetArgvEx(0, NULL, 0)``.

3
Python/sysmodule.c
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@ -3080,9 +3080,10 @@ make_sys_argv(int argc, wchar_t * const * argv)
void void
PySys_SetArgvEx(int argc, wchar_t **argv, int updatepath) PySys_SetArgvEx(int argc, wchar_t **argv, int updatepath)
{ {
wchar_t* empty_argv[1] = {L""};
if (argc < 1 || argv == NULL) { if (argc < 1 || argv == NULL) {
/* Ensure at least one (empty) argument is seen */ /* Ensure at least one (empty) argument is seen */
wchar_t* empty_argv[1] = {L""};
argv = empty_argv; argv = empty_argv;
argc = 1; argc = 1;
} }