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staging: most: net: fix buffer overflow 

If the length of the socket buffer is 0xFFFFFFFF (max size for an
unsigned int), then payload_len becomes 0xFFFFFFF1 after subtracting 14
(ETH_HLEN).  Then, mdp_len is set to payload_len + 16 (MDP_HDR_LEN)
which overflows and results in a value of 2.  These values for
payload_len and mdp_len will pass current buffer size checks.

This patch checks if derived from skb->len sum may overflow.

The check is based on the following idea:

For any `unsigned V1, V2` and derived `unsigned SUM = V1 + V2`,
`V1 + V2` overflows iif `SUM < V1`.

Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200116172238.6046-1-andrey.shvetsov@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Shvetsov 2020-01-16 18:22:39 +01:00 committed by Greg Kroah-Hartman
parent 3063da91ca
commit 4d1356ac12
1 changed files with 10 additions and 0 deletions
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10
drivers/staging/most/net/net.c
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@ -82,6 +82,11 @@ static int skb_to_mamac(const struct sk_buff *skb, struct mbo *mbo)
unsigned int payload_len = skb->len - ETH_HLEN;
unsigned int mdp_len = payload_len + MDP_HDR_LEN;
if (mdp_len < skb->len) {
pr_err("drop: too large packet! (%u)\n", skb->len);
return -EINVAL;
}
if (mbo->buffer_length < mdp_len) {
pr_err("drop: too small buffer! (%d for %d)\n",
mbo->buffer_length, mdp_len);
@ -129,6 +134,11 @@ static int skb_to_mep(const struct sk_buff *skb, struct mbo *mbo)
u8 *buff = mbo->virt_address;
unsigned int mep_len = skb->len + MEP_HDR_LEN;
if (mep_len < skb->len) {
pr_err("drop: too large packet! (%u)\n", skb->len);
return -EINVAL;
}
if (mbo->buffer_length < mep_len) {
pr_err("drop: too small buffer! (%d for %d)\n",
mbo->buffer_length, mep_len);