2.6.35-longterm review patch. If anyone has any objections, please let me know.
------------------ From: Tetsuo Handa <[email protected]> commit 78d2978874e4e10e97dfd4fd79db45bdc0748550 upstream. 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 <[email protected]> Signed-off-by: David Howells <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Andi Kleen <[email protected]> --- fs/file_table.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.35.y/fs/file_table.c =================================================================== --- linux-2.6.35.y.orig/fs/file_table.c 2011-03-29 22:51:20.759191992 -0700 +++ linux-2.6.35.y/fs/file_table.c 2011-03-29 23:03:00.692282457 -0700 @@ -123,13 +123,13 @@ 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 */ _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
