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authorTakashi Iwai <tiwai@suse.de>2018-03-23 08:03:26 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-24 09:34:15 +0200
commit3724f9c7dd1e7373d5db4098b1e17a48b2fe2421 (patch)
tree38acf729277ab6b9d705c91be60c1e2969a781c8 /include/sound
parent159a13647f3fafa26809b939bd9a5f0a54c87118 (diff)
ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams
commit 40cab6e88cb0b6c56d3f30b7491a20e803f948f6 upstream. OSS PCM stream management isn't modal but it allows ioctls issued at any time for changing the parameters. In the previous hardening patch ("ALSA: pcm: Avoid potential races between OSS ioctls and read/write"), we covered these races and prevent the corruption by protecting the concurrent accesses via params_lock mutex. However, this means that some ioctls that try to change the stream parameter (e.g. channels or format) would be blocked until the read/write finishes, and it may take really long. Basically changing the parameter while reading/writing is an invalid operation, hence it's even more user-friendly from the API POV if it returns -EBUSY in such a situation. This patch adds such checks in the relevant ioctls with the addition of read/write access refcount. Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/pcm_oss.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/pcm_oss.h b/include/sound/pcm_oss.h
index 760c969d885d..12bbf8c81112 100644
--- a/include/sound/pcm_oss.h
+++ b/include/sound/pcm_oss.h
@@ -57,6 +57,7 @@ struct snd_pcm_oss_runtime {
char *buffer; /* vmallocated period */
size_t buffer_used; /* used length from period buffer */
struct mutex params_lock;
+ atomic_t rw_ref; /* concurrent read/write accesses */
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
struct snd_pcm_plugin *plugin_first;
struct snd_pcm_plugin *plugin_last;