Begin forwarded message:
Date: Wed, 15 Sep 2010 02:18:35 +0000 (UTC)
From: Chuck Ebbert <cebbert@xxxxxxxxxxxxxxxxx>
To: kernel-owner@xxxxxxxxxxxxxxxxx, scm-commits@xxxxxxxxxxxxxxxxxxxxxxx
Subject: [kernel/f13/master] Fix CVE-2010-3080: /dev/sequencer open failure is not handled correctly
commit 5bfd09461d7205c2b9fb83f97b00ae3e1ed19058
Author: Chuck Ebbert <cebbert@xxxxxxxxxx>
Date: Tue Sep 14 22:17:35 2010 -0400
Fix CVE-2010-3080: /dev/sequencer open failure is not handled correctly
...le-free-at-error-path-of-snd_seq_oss_open.patch | 53 ++++++++++++++++++++
kernel.spec | 9 +++
2 files changed, 62 insertions(+), 0 deletions(-)
---
diff --git a/alsa-seq-oss-fix-double-free-at-error-path-of-snd_seq_oss_open.patch b/alsa-seq-oss-fix-double-free-at-error-path-of-snd_seq_oss_open.patch
new file mode 100644
index 0000000..73e65ec
--- /dev/null
+++ b/alsa-seq-oss-fix-double-free-at-error-path-of-snd_seq_oss_open.patch
@@ -0,0 +1,53 @@
+From: Takashi Iwai <tiwai@xxxxxxx>
+Date: Mon, 6 Sep 2010 07:13:45 +0000 (+0200)
+Subject: ALSA: seq/oss - Fix double-free at error path of snd_seq_oss_open()
+X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=27f7ad53829f79e799a253285318bff79ece15bd
+
+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@xxxxxxxxxxxxx>
+Cc: <stable@xxxxxxxxxx>
+Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
+---
+
+diff --git a/sound/core/seq/oss/seq_oss_init.c b/sound/core/seq/oss/seq_oss_init.c
+index 6857122..69cd7b3 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);
diff --git a/kernel.spec b/kernel.spec
index 90e84f7..15b40a2 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -802,6 +802,9 @@ Patch12540: execve-improve-interactivity-with-large-arguments.patch
Patch12541: execve-make-responsive-to-sigkill-with-large-arguments.patch
Patch12542: setup_arg_pages-diagnose-excessive-argument-size.patch
+# CVE-2010-3080
+Patch12550: alsa-seq-oss-fix-double-free-at-error-path-of-snd_seq_oss_open.patch
+
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@@ -1513,6 +1516,9 @@ ApplyPatch execve-improve-interactivity-with-large-arguments.patch
ApplyPatch execve-make-responsive-to-sigkill-with-large-arguments.patch
ApplyPatch setup_arg_pages-diagnose-excessive-argument-size.patch
+# CVE-2010-3080
+ApplyPatch alsa-seq-oss-fix-double-free-at-error-path-of-snd_seq_oss_open.patch
+
# END OF PATCH APPLICATIONS
%endif
@@ -2135,6 +2141,9 @@ fi
%changelog
* Tue Sep 14 2010 Chuck Ebbert <cebbert@xxxxxxxxxx> 2.6.34.7-57
+- Fix CVE-2010-3080: /dev/sequencer open failure is not handled correctly
+
+* Tue Sep 14 2010 Chuck Ebbert <cebbert@xxxxxxxxxx>
- Fix bug added in 2.6.34.6-53
* Tue Sep 14 2010 Chuck Ebbert <cebbert@xxxxxxxxxx>
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