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[media] si2157: Bounds check firmware

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When reading the firmware and sending commands, the length
must be bounds checked to avoid overrunning the size of the command
buffer and smashing the stack if the firmware is not in the
expected format. Add the proper check.

Cc: [email protected]
Signed-off-by: Laura Abbott <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Laura Abbott 2015-09-29 21:10:10 -03:00 • committed by Mauro Carvalho Chehab
commit a828d72df2
1 changed files with 4 additions and 0 deletions
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4
drivers/media/tuners/si2157.c
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@ -166,6 +166,10 @@ static int si2157_init(struct dvb_frontend *fe)
for (remaining = fw->size; remaining > 0; remaining -= 17) {
len = fw->data[fw->size - remaining];
if (len > SI2157_ARGLEN) {
dev_err(&client->dev, "Bad firmware length\n");
goto err_release_firmware;
}
memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len);
cmd.wlen = len;
cmd.rlen = 1;