diff options
| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2014-06-19 18:49:40 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-07-23 04:15:41 +0400 |
| commit | 18d75a09e954b72de6e85a8fb172835be547a48a (patch) | |
| tree | fa2e7853955b71152965eb4fdaa3020ecaeba492 | |
| parent | 58632818ab7bc627eb1273c1f3525e2819a07b01 (diff) | |
| download | linux-18d75a09e954b72de6e85a8fb172835be547a48a.tar.xz | |
[media] media: dib9000: avoid out of bound access
This updated patch also fixes out of bound access to b[].
In dib9000_risc_apb_access_write() an out of bound access to mb[].
The current test to avoid out of bound access to mb[] is insufficient.
For len = 19 non-existent mb[10] will be accessed.
For odd values of len b[] is accessed out of bounds.
For large values of len an of bound access to mb[] may occur in
dib9000_mbx_send_attr.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
| -rw-r--r-- | drivers/media/dvb-frontends/dib9000.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/media/dvb-frontends/dib9000.c b/drivers/media/dvb-frontends/dib9000.c index e540cfb13bac..f75dec443783 100644 --- a/drivers/media/dvb-frontends/dib9000.c +++ b/drivers/media/dvb-frontends/dib9000.c @@ -1040,13 +1040,18 @@ static int dib9000_risc_apb_access_write(struct dib9000_state *state, u32 addres if (address >= 1024 || !state->platform.risc.fw_is_running) return -EINVAL; + if (len > 18) + return -EINVAL; + /* dprintk( "APB access thru wr fw %d %x", address, attribute); */ - mb[0] = (unsigned short)address; - for (i = 0; i < len && i < 20; i += 2) - mb[1 + (i / 2)] = (b[i] << 8 | b[i + 1]); + mb[0] = (u16)address; + for (i = 0; i + 1 < len; i += 2) + mb[1 + i / 2] = b[i] << 8 | b[i + 1]; + if (len & 1) + mb[1 + len / 2] = b[len - 1] << 8; - dib9000_mbx_send_attr(state, OUT_MSG_BRIDGE_APB_W, mb, 1 + len / 2, attribute); + dib9000_mbx_send_attr(state, OUT_MSG_BRIDGE_APB_W, mb, (3 + len) / 2, attribute); return dib9000_mbx_get_message_attr(state, IN_MSG_END_BRIDGE_APB_RW, mb, &s, attribute) == 1 ? 0 : -EINVAL; } |