From: Florian Weimer <fweimer@redhat.com>
To: libc-stable@sourceware.org
Subject: [2.30 COMMITTED] login: Remove double-assignment of fl.l_whence in try_file_lock
Date: Wed, 01 Jan 2020 00:00:00 -0000 [thread overview]
Message-ID: <20200117140435.0E3488299EE2@oldenburg2.str.redhat.com> (raw)
Since l_whence is the second member of struct flock, it is written
twice. The double-assignment is technically undefined behavior due to
the lack of a sequence point.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Change-Id: I2baf9e70690e723c61051b25ccbd510aec15976c
(cherry picked from commit b0a83ae71b2588bd2a9e6b40f95191602940e01e)
diff --git a/login/utmp_file.c b/login/utmp_file.c
index 2d0548f6fa..74ec622e96 100644
--- a/login/utmp_file.c
+++ b/login/utmp_file.c
@@ -79,7 +79,7 @@ try_file_lock (int fd, int type)
struct flock64 fl =
{
.l_type = type,
- fl.l_whence = SEEK_SET,
+ .l_whence = SEEK_SET,
};
bool status = __fcntl64_nocancel (fd, F_SETLKW, &fl) < 0;
reply other threads:[~2020-01-17 14:04 UTC|newest]
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