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[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>
This commit is contained in:
Heinrich Schuchardt 2014-06-19 11:49:40 -03:00 committed by Mauro Carvalho Chehab
parent 58632818ab
commit 18d75a09e9
1 changed files with 9 additions and 4 deletions
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13
drivers/media/dvb-frontends/dib9000.c
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@ -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;
}