ALSA: rme9652: Hardening for potential Spectre v1

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commit f526afcd8f upstream.

As recently Smatch suggested, one place in RME9652 driver may expand
the array directly from the user-space value with speculation:
  sound/pci/rme9652/rme9652.c:2074 snd_rme9652_channel_info() warn: potential spectre issue 'rme9652->channel_map' (local cap)

This patch puts array_index_nospec() for hardening against it.

BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Takashi Iwai 2018-04-24 08:04:41 +02:00 • committed by Ben Hutchings

parent 01d4acf218

commit 31ba7f2f7d

1 changed files with 4 additions and 2 deletions

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sound/pci/rme9652/rme9652.c

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