diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2014-09-09 09:11:23 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-09-23 16:13:39 -0300 |
| commit | 7ac95cf59d59473e680937319594ce0719497e98 (patch) | |
| tree | b7cb5b002d0e71aacb17868f228d880cf8d5a2cb /drivers/media | |
| parent | cf3b576d52c1f0a204f0c8bdecc22a338f7ca5a4 (diff) | |
[media] firewire: firedtv-avc: fix more potential buffer overflow
"program_info_length" is user controlled and can go up to 4095. The
operand[] array has 509 bytes so we need to add a limit here to prevent
buffer overflows.
The " - 4" in the limit check is because we have 4 bytes more data to
add after the memcpy().
[mchehab@osg.samsung.com: as I merged the version 1 of the patch, I needed
to rebase to apply just the differences between v1 and v2]
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/firewire/firedtv-avc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/firewire/firedtv-avc.c b/drivers/media/firewire/firedtv-avc.c index ac17567f0822..251a556112a9 100644 --- a/drivers/media/firewire/firedtv-avc.c +++ b/drivers/media/firewire/firedtv-avc.c @@ -1157,7 +1157,7 @@ int avc_ca_pmt(struct firedtv *fdtv, char *msg, int length) if (pmt_cmd_id != 1 && pmt_cmd_id != 4) dev_err(fdtv->device, "invalid pmt_cmd_id %d\n", pmt_cmd_id); - if (program_info_length > sizeof(c->operand) - write_pos) { + if (program_info_length > sizeof(c->operand) - 4 - write_pos) { ret = -EINVAL; goto out; } @@ -1184,7 +1184,8 @@ int avc_ca_pmt(struct firedtv *fdtv, char *msg, int length) dev_err(fdtv->device, "invalid pmt_cmd_id %d " "at stream level\n", pmt_cmd_id); - if (es_info_length > sizeof(c->operand) - write_pos) { + if (es_info_length > sizeof(c->operand) - 4 - + write_pos) { ret = -EINVAL; goto out; } |