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| author | dann frazier <dann.frazier@canonical.com> | 2010-11-18 15:03:09 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-21 12:45:04 -0700 |
| commit | 2bc3c404decf406bfadd88001945bc2673fc6e4f (patch) | |
| tree | 928722b3ab9101f7aa9b8ad7485b47b036b8bd1f /fs/ocfs2 | |
| parent | 57c247a86588c5602e26367728be7fd61d3b334a (diff) | |
| download | lwn-2bc3c404decf406bfadd88001945bc2673fc6e4f.tar.gz lwn-2bc3c404decf406bfadd88001945bc2673fc6e4f.zip | |
ocfs2_connection_find() returns pointer to bad structure
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 <dann.frazier@canonical.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | 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 da78a2a334fd..197249ef2e43 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; } /* |