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Fix infinite loop in check_pf (BZ #12926)

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The recvmsg could return 0 under some conditions and cause the
make_request function to be stuck in an infinite loop.

Thank you Jim King <jim.king@simplivity.com> for posting Paul's patch
on the list.
This commit is contained in:
Siddhesh Poyarekar 2014-10-14 21:05:33 +05:30
parent fcb32af153
commit fda389c8f0
3 changed files with 8 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-10-14 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #12926]
* sysdeps/unix/sysv/linux/check_pf.c (make_request): Avoid
infinite loop when __recvmsg returns 0.
2014-10-10 Joseph Myers <joseph@codesourcery.com> 2014-10-10 Joseph Myers <joseph@codesourcery.com>
* CANCEL-FCT-WAIVE: Remove file. * CANCEL-FCT-WAIVE: Remove file.

2
NEWS
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@ -9,7 +9,7 @@ Version 2.21
* The following bugs are resolved with this release: * The following bugs are resolved with this release:
6652, 14171, 17266, 17363, 17370, 17371, 17411, 17460. 6652, 12926, 14171, 17266, 17363, 17370, 17371, 17411, 17460.
Version 2.20 Version 2.20

2
sysdeps/unix/sysv/linux/check_pf.c
View File

@ -180,7 +180,7 @@ make_request (int fd, pid_t pid)
}; };
ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0)); ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
if (read_len < 0) if (read_len <= 0)
goto out_fail2; goto out_fail2;
if (msg.msg_flags & MSG_TRUNC) if (msg.msg_flags & MSG_TRUNC)