This is a note to let you know that I've just added the patch titled
posix_acl: handle NULL ACL in posix_acl_equiv_mode
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
posix_acl-handle-null-acl-in-posix_acl_equiv_mode.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 50c6e282bdf5e8dabf8d7cf7b162545a55645fd9 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <[email protected]>
Date: Sun, 4 May 2014 13:03:32 +0200
Subject: posix_acl: handle NULL ACL in posix_acl_equiv_mode
From: Christoph Hellwig <[email protected]>
commit 50c6e282bdf5e8dabf8d7cf7b162545a55645fd9 upstream.
Various filesystems don't bother checking for a NULL ACL in
posix_acl_equiv_mode, and thus can dereference a NULL pointer when it
gets passed one. This usually happens from the NFS server, as the ACL tools
never pass a NULL ACL, but instead of one representing the mode bits.
Instead of adding boilerplat to all filesystems put this check into one place,
which will allow us to remove the check from other filesystems as well later
on.
Signed-off-by: Christoph Hellwig <[email protected]>
Reported-by: Ben Greear <[email protected]>
Reported-by: Marco Munderloh <[email protected]>,
Cc: Chuck Lever <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/posix_acl.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -158,6 +158,12 @@ posix_acl_equiv_mode(const struct posix_
umode_t mode = 0;
int not_equiv = 0;
+ /*
+ * A null ACL can always be presented as mode bits.
+ */
+ if (!acl)
+ return 0;
+
FOREACH_ACL_ENTRY(pa, acl, pe) {
switch (pa->e_tag) {
case ACL_USER_OBJ:
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/posix_acl-handle-null-acl-in-posix_acl_equiv_mode.patch
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