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| author | Rich Felker <dalias@aerifal.cx> | 2012-10-19 15:02:37 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012-10-19 15:02:37 -0400 |
| commit | 599f97360389911c293e0ca4c5eb49e007377fba (patch) | |
| tree | 9df3f1e50357956c4cc76cd8e2872f342c80bf3c /src/stdio | |
| parent | ebee8c2b477807fe58fd35d35783633ea08b049c (diff) | |
| download | musl-599f97360389911c293e0ca4c5eb49e007377fba.tar.gz musl-599f97360389911c293e0ca4c5eb49e007377fba.tar.bz2 musl-599f97360389911c293e0ca4c5eb49e007377fba.tar.xz musl-599f97360389911c293e0ca4c5eb49e007377fba.zip | |
fix usage of locks with vfork
__release_ptc() is only valid in the parent; if it's performed in the
child, the lock will be unlocked early then double-unlocked later,
corrupting the lock state.
Diffstat (limited to 'src/stdio')
| -rw-r--r-- | src/stdio/popen.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/stdio/popen.c b/src/stdio/popen.c index 0c9f24e3..5a47509e 100644 --- a/src/stdio/popen.c +++ b/src/stdio/popen.c @@ -38,9 +38,9 @@ FILE *popen(const char *cmd, const char *mode) __acquire_ptc(); pid = __vfork(); - __release_ptc(); if (pid) { + __release_ptc(); __syscall(SYS_close, p[1-op]); sigprocmask(SIG_BLOCK, SIGALL_SET, &old); if (pid < 0) { |