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authorTakashi Iwai <tiwai@suse.de>2010-09-06 09:13:45 +0200
committerTakashi Iwai <tiwai@suse.de>2010-09-08 10:45:34 +0200
commit27f7ad53829f79e799a253285318bff79ece15bd (patch)
tree5b1756cf310d944c5655e07398e77c408e7b4341 /sound
parente4ee8dd8afcbcbe502fa8a3d3af6eb09c96dd806 (diff)
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ALSA: seq/oss - Fix double-free at error path of snd_seq_oss_open()
The error handling in snd_seq_oss_open() has several bad codes that do dereferecing released pointers and double-free of kmalloc'ed data. The object dp is release in free_devinfo() that is called via private_free callback. The rest shouldn't touch this object any more. The patch changes delete_port() to call kfree() in any case, and gets rid of unnecessary calls of destructors in snd_seq_oss_open(). Fixes CVE-2010-3080. Reported-and-tested-by: Tavis Ormandy <taviso@cmpxchg8b.com> Cc: <stable@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/seq/oss/seq_oss_init.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/sound/core/seq/oss/seq_oss_init.c b/sound/core/seq/oss/seq_oss_init.c
index 685712276ac..69cd7b3c362 100644
--- a/sound/core/seq/oss/seq_oss_init.c
+++ b/sound/core/seq/oss/seq_oss_init.c
@@ -281,13 +281,10 @@ snd_seq_oss_open(struct file *file, int level)
return 0;
_error:
- snd_seq_oss_writeq_delete(dp->writeq);
- snd_seq_oss_readq_delete(dp->readq);
snd_seq_oss_synth_cleanup(dp);
snd_seq_oss_midi_cleanup(dp);
- delete_port(dp);
delete_seq_queue(dp->queue);
- kfree(dp);
+ delete_port(dp);
return rc;
}
@@ -350,8 +347,10 @@ create_port(struct seq_oss_devinfo *dp)
static int
delete_port(struct seq_oss_devinfo *dp)
{
- if (dp->port < 0)
+ if (dp->port < 0) {
+ kfree(dp);
return 0;
+ }
debug_printk(("delete_port %i\n", dp->port));
return snd_seq_event_port_detach(dp->cseq, dp->port);