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Candidate: CVE-2005-3356
References:
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=7c7dce9209161eb260cdf9e9172f72c3a02379e6h+p=12dbf3fc4d06d2c0c4c44dc0612df04248b3cfd3
Description:
[PATCH] Fix double decrement of mqueue_mnt->mnt_count in sys_mq_open
.
Fixed the refcounting on failure exits in sys_mq_open() and
cleaned the logics up. Rules are actually pretty simple - dentry_open()
expects vfsmount and dentry to be pinned down and it either transfers
them into created struct file or drops them. Old code had been very
confused in that area - if dentry_open() had failed either in do_open()
or do_create(), we ended up dentry and mqueue_mnt dropped twice, once
by dentry_open() cleanup and then by sys_mq_open().
.
Fix consists of making the rules for do_create() and do_open()
same as for dentry_open() and updating the sys_mq_open() accordingly;
that actually leads to more straightforward code and less work on
normal path.
.
Signed-off-by: Al Viro <aviro@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Notes:
jmm> Discovered by Doug Chapman
Bugs:
upstream: released (2.6.15.2)
linux-2.6: released (2.6.15-4)
2.6.8-sarge-security: released (2.6.8-16sarge2)
2.4.27-sarge-security: N/A
2.4.19-woody-security: N/A
2.4.18-woody-security: N/A
2.4.17-woody-security: N/A
2.4.16-woody-security: N/A
2.4.17-woody-security-hppa: N/A
2.4.17-woody-security-ia64: N/A
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