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| author | Vasiliy Kulikov <segoon@openwall.com> | 2010-11-26 17:06:35 (GMT) |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-12-29 10:17:02 (GMT) |
| commit | 4c8b8698053c986f5f5249878eab70cb028a1023 (patch) | |
| tree | d7e6f5b35bc7b7a2cf9dd26436177f02d6ac2e77 /drivers/media/rc/ir-lirc-codec.c | |
| parent | 87d1a50ce45168cbaec10397e876286a398052c1 (diff) | |
| download | linux-4c8b8698053c986f5f5249878eab70cb028a1023.tar.xz | |
[media] rc: ir-lirc-codec: fix potential integer overflow
'n' may be bigger than MAX_INT*sizeof(int), if so checking of truncated
(int)(n/sizeof(int)) for LIRCBUF_SIZE overflow and then using nontruncated 'count'
doesn't make sense. Also n may be up to sizeof(int)-1 bytes bigger than expected,
so check value of (n % sizeof(int)) too.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/rc/ir-lirc-codec.c')
| -rw-r--r-- | drivers/media/rc/ir-lirc-codec.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c index 1e87ee8..f011c5d 100644 --- a/drivers/media/rc/ir-lirc-codec.c +++ b/drivers/media/rc/ir-lirc-codec.c @@ -100,7 +100,8 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf, struct lirc_codec *lirc; struct rc_dev *dev; int *txbuf; /* buffer with values to transmit */ - int ret = 0, count; + int ret = 0; + size_t count; lirc = lirc_get_pdata(file); if (!lirc) @@ -110,7 +111,7 @@ static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf, return -EINVAL; count = n / sizeof(int); - if (count > LIRCBUF_SIZE || count % 2 == 0) + if (count > LIRCBUF_SIZE || count % 2 == 0 || n % sizeof(int) != 0) return -EINVAL; txbuf = memdup_user(buf, n); |