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Fix use of __pthread_attr_copy in mq_notify (bug 27896)
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__pthread_attr_copy can fail and does not initialize the attribute
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structure in that case.
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If __pthread_attr_copy is never called and there is no allocated
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attribute, pthread_attr_destroy should not be called, otherwise
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there is a null pointer dereference in rt/tst-mqueue6.
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Fixes commit 42d359350510506b87101cf77202fefcbfc790cb
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("Use __pthread_attr_copy in mq_notify (bug 27896)").
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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(cherry picked from commit 217b6dc298156bdb0d6aea9ea93e7e394a5ff091)
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diff --git a/sysdeps/unix/sysv/linux/mq_notify.c b/sysdeps/unix/sysv/linux/mq_notify.c
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index c4091169306ffde8..45449571d14c379f 100644
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--- a/sysdeps/unix/sysv/linux/mq_notify.c
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+++ b/sysdeps/unix/sysv/linux/mq_notify.c
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@@ -260,7 +260,14 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification)
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if (data.attr == NULL)
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return -1;
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- __pthread_attr_copy (data.attr, notification->sigev_notify_attributes);
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+ int ret = __pthread_attr_copy (data.attr,
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+ notification->sigev_notify_attributes);
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+ if (ret != 0)
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+ {
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+ free (data.attr);
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+ __set_errno (ret);
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+ return -1;
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+ }
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}
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/* Construct the new request. */
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@@ -273,7 +280,7 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification)
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int retval = INLINE_SYSCALL (mq_notify, 2, mqdes, &se);
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/* If it failed, free the allocated memory. */
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- if (__glibc_unlikely (retval != 0))
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+ if (retval != 0 && data.attr != NULL)
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{
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pthread_attr_destroy (data.attr);
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free (data.attr);
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