ALSA: asihpi: Hardening for potential Spectre v1

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commit f9d94b57e3 upstream.

As recently Smatch suggested, a couple of places in ASIHPI driver may
expand the array directly from the user-space value with speculation:
  sound/pci/asihpi/hpimsginit.c:70 hpi_init_response() warn: potential spectre issue 'res_size' (local cap)
  sound/pci/asihpi/hpioctl.c:189 asihpi_hpi_ioctl() warn: potential spectre issue 'adapters'

This patch puts array_index_nospec() for hardening against them.

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>

...

This commit is contained in:

Takashi Iwai 2018-04-24 08:01:48 +02:00 • committed by Ben Hutchings

parent bc98b76ebc

commit 14f4dd7cff

2 changed files with 12 additions and 5 deletions

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13

sound/pci/asihpi/hpimsginit.c

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4

sound/pci/asihpi/hpioctl.c

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