From: dann frazier <[email protected]> ------------------- This is a commit scheduled for the next v2.6.34 longterm release. If you see a problem with using this for longterm, please comment. -------------------
commit 226291aa4641fa13cb5dec3bcb3379faa83009e2 upstream. If ocfs2_live_connection_list is empty, ocfs2_connection_find() will return a pointer to the LIST_HEAD, cast as a ocfs2_live_connection. This can cause an oops when ocfs2_control_send_down() dereferences c->oc_conn: Call Trace: [<ffffffffa00c2a3c>] ocfs2_control_message+0x28c/0x2b0 [ocfs2_stack_user] [<ffffffffa00c2a95>] ocfs2_control_write+0x35/0xb0 [ocfs2_stack_user] [<ffffffff81143a88>] vfs_write+0xb8/0x1a0 [<ffffffff8155cc13>] ? do_page_fault+0x153/0x3b0 [<ffffffff811442f1>] sys_write+0x51/0x80 [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b Fix by explicitly returning NULL if no match is found. Signed-off-by: dann frazier <[email protected]> Signed-off-by: Joel Becker <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- fs/ocfs2/stack_user.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c index 2dc57bc..22db114 100644 --- a/fs/ocfs2/stack_user.c +++ b/fs/ocfs2/stack_user.c @@ -191,7 +191,7 @@ static struct ocfs2_live_connection *ocfs2_connection_find(const char *name) return c; } - return c; + return NULL; } /* -- 1.7.4.4 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
