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authorTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>2011-02-04 18:13:24 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-04 10:40:29 -0800
commit78d2978874e4e10e97dfd4fd79db45bdc0748550 (patch)
tree5a07ba8b01c52632638a1724a5dcbf6d0606da73
parentbb5b583b52794efc7b59f70a78be1b66a98dd939 (diff)
downloadop-kernel-dev-78d2978874e4e10e97dfd4fd79db45bdc0748550.zip
op-kernel-dev-78d2978874e4e10e97dfd4fd79db45bdc0748550.tar.gz
CRED: Fix kernel panic upon security_file_alloc() failure.
In get_empty_filp() since 2.6.29, file_free(f) is called with f->f_cred == NULL when security_file_alloc() returned an error. As a result, kernel will panic() due to put_cred(NULL) call within RCU callback. Fix this bug by assigning f->f_cred before calling security_file_alloc(). Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/file_table.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index c3e89ad..eb36b6b 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -125,13 +125,13 @@ struct file *get_empty_filp(void)
goto fail;
percpu_counter_inc(&nr_files);
+ f->f_cred = get_cred(cred);
if (security_file_alloc(f))
goto fail_sec;
INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_long_set(&f->f_count, 1);
rwlock_init(&f->f_owner.lock);
- f->f_cred = get_cred(cred);
spin_lock_init(&f->f_lock);
eventpoll_init_file(f);
/* f->f_version: 0 */
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