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io.c (rb_update_max_fd): fail with a negative file descripter

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Coverity Scan points out that ext/socket/unixsocket.c may pass -1 to
rb_update_max_fd.  I'm unsure whether it can happen actually or not, but
it would be good for the function to reject a negative value.
This commit is contained in:
Yusuke Endoh 2019-10-13 00:49:18 +09:00
parent ebc2198d9f
commit 90b9900dc1
1 changed files with 1 additions and 1 deletions
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io.c
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@ -201,7 +201,7 @@ rb_update_max_fd(int fd)
rb_atomic_t max_fd = max_file_descriptor;
int err;
if (afd <= max_fd)
if (fd < 0 || afd <= max_fd)
return;
#if defined(HAVE_FCNTL) && defined(F_GETFL)