ALSA: seq: Add sanity check for user-space pointer delivery

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The sequencer event may contain a user-space pointer with its
SNDRV_SEQ_EXT_USRPTR bit, and we assure that its delivery is limited
with non-atomic mode.  Otherwise the copy_from_user() may hit the
fault and cause a problem.  Although the core code doesn't set such a
flag (only set at snd_seq_write()), any wild driver may set it
mistakenly and lead to an unexpected crash.

This patch adds a sanity check of such events at the delivery core
code to filter out the invalid invocation in the atomic mode.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Takashi Iwai 2017-10-09 17:05:35 +02:00

parent a6aa6cdcec

commit 19b592dae8

1 changed files with 4 additions and 0 deletions

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sound/core/seq/seq_clientmgr.c

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