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.g...@gmx.de>
---
drivers/media/dvb-frontends/dib9000.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/media/dvb-frontends/dib9000.c
b/drivers/media/dvb-frontends/dib9000.c
index e540cfb..f75dec4 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;
}
--
2.0.0
--
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