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authorTakashi Iwai2021-12-01 08:36:05 +0100
committerTakashi Iwai2021-12-02 09:01:58 +0100
commit8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 (patch)
tree527b7c4e1556ef64e69690f90dfa8fe47a6a9f3a /sound/core
parent9d2479c960875ca1239bcb899f386970c13d9cfe (diff)
ALSA: pcm: oss: Limit the period size to 16MB
Set the practical limit to the period size (the fragment shift in OSS) instead of a full 31bit; a too large value could lead to the exhaust of memory as we allocate temporary buffers of the period size, too. As of this patch, we set to 16MB limit, which should cover all use cases. Reported-by: syzbot+bb348e9f9a954d42746f@syzkaller.appspotmail.com Reported-by: Bixuan Cui <cuibixuan@linux.alibaba.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/1638270978-42412-1-git-send-email-cuibixuan@linux.alibaba.com Link: https://lore.kernel.org/r/20211201073606.11660-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/oss/pcm_oss.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index bec7590bc84b..89c4910daf02 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1962,7 +1962,7 @@ static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsign
if (runtime->oss.subdivision || runtime->oss.fragshift)
return -EINVAL;
fragshift = val & 0xffff;
- if (fragshift >= 31)
+ if (fragshift >= 25) /* should be large enough */
return -EINVAL;
runtime->oss.fragshift = fragshift;
runtime->oss.maxfrags = (val >> 16) & 0xffff;