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authorJaroslav Kysela <perex@perex.cz>2010-07-19 10:37:39 -0400
committerJaroslav Kysela <perex@perex.cz>2010-07-19 10:47:01 -0400
commit9e216e8a40428cbf689222148c28d0256fbd0186 (patch)
tree66b750cb33712c853d887a648f94875346b445d5 /sound
parent79c944ad136c4d14388d803b51113dcaaa1d179d (diff)
ALSA: pcm core - add a safe check to the silence filling function
In situation when appl_ptr is far greater then hw_ptr, the hw_avail value can be greater than buffer_size. Check for this. Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/pcm_lib.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index bcf95d3ff5c7..e23e0e7ab26f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -67,6 +67,8 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
67 } else { 67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */ 68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); 69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 if (avail > runtime->buffer_size)
71 avail = runtime->buffer_size;
70 runtime->silence_filled = avail > 0 ? avail : 0; 72 runtime->silence_filled = avail > 0 ? avail : 0;
71 runtime->silence_start = (runtime->status->hw_ptr + 73 runtime->silence_start = (runtime->status->hw_ptr +
72 runtime->silence_filled) % 74 runtime->silence_filled) %