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[media] rc: ir-lirc-codec: fix potential integer overflow

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'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>
This commit is contained in:
Vasiliy Kulikov 2010-11-26 14:06:35 -03:00 committed by Mauro Carvalho Chehab
parent 87d1a50ce4
commit 4c8b869805
1 changed files with 3 additions and 2 deletions
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5
drivers/media/rc/ir-lirc-codec.c
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@ -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);