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| author | Colin Ian King <colin.king@canonical.com> | 2019-06-27 17:58:53 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-06-28 10:41:17 +0200 |
| commit | 3fc4147653130c5d49d07e06186628e29ba9f39d (patch) | |
| tree | 8c54904723ccb91d62799875f7670168cfae5796 /sound/xen | |
| parent | 801ebf1043ae7b182588554cc9b9ad3c14bc2ab5 (diff) | |
| download | lwn-3fc4147653130c5d49d07e06186628e29ba9f39d.tar.gz lwn-3fc4147653130c5d49d07e06186628e29ba9f39d.zip | |
ALSA: xen-front: fix unintention integer overflow on left shifts
Shifting the integer value 1 is evaluated using 32-bit
arithmetic and then used in an expression that expects a 64-bit
value, so there is potentially an integer overflow. Fix this
by using the BIT_ULL macro to perform the shift.
[ Note: as of the time being, no actual integer overflow hits because
all values are less than 32bit, not including the extended 3-byte or
DSD formats. But this is the right fix for future usage, of
course. -- tiwai ]
Addresses-Coverity: ("Unintentional integer overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/xen')
| -rw-r--r-- | sound/xen/xen_snd_front_alsa.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/xen/xen_snd_front_alsa.c b/sound/xen/xen_snd_front_alsa.c index b14ab512c2ce..e01631959ed8 100644 --- a/sound/xen/xen_snd_front_alsa.c +++ b/sound/xen/xen_snd_front_alsa.c @@ -196,7 +196,7 @@ static u64 to_sndif_formats_mask(u64 alsa_formats) mask = 0; for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) if (pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa) & alsa_formats) - mask |= 1 << ALSA_SNDIF_FORMATS[i].sndif; + mask |= BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif); return mask; } @@ -208,7 +208,7 @@ static u64 to_alsa_formats_mask(u64 sndif_formats) mask = 0; for (i = 0; i < ARRAY_SIZE(ALSA_SNDIF_FORMATS); i++) - if (1 << ALSA_SNDIF_FORMATS[i].sndif & sndif_formats) + if (BIT_ULL(ALSA_SNDIF_FORMATS[i].sndif) & sndif_formats) mask |= pcm_format_to_bits(ALSA_SNDIF_FORMATS[i].alsa); return mask; |