diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-05-27 21:48:30 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2020-05-29 20:40:22 +0300 |
| commit | 11e7a91994c29da96d847f676be023da6a2c1359 (patch) | |
| tree | 5803e9975cb461084b7c68bb07f292f854893304 /drivers/net/wireless/cisco | |
| parent | 113a57a400a2d4974448760464f6443d52a1e498 (diff) | |
| download | linux-11e7a91994c29da96d847f676be023da6a2c1359.tar.bz2 | |
airo: Fix read overflows sending packets
The problem is that we always copy a minimum of ETH_ZLEN (60) bytes from
skb->data even when skb->len is less than ETH_ZLEN so it leads to a read
overflow.
The fix is to pad skb->data to at least ETH_ZLEN bytes.
Cc: <stable@vger.kernel.org>
Reported-by: Hu Jiahui <kirin.say@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200527184830.GA1164846@mwanda
Diffstat (limited to 'drivers/net/wireless/cisco')
| -rw-r--r-- | drivers/net/wireless/cisco/airo.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c index 8363f91df7ea..827bb6d74815 100644 --- a/drivers/net/wireless/cisco/airo.c +++ b/drivers/net/wireless/cisco/airo.c @@ -1925,6 +1925,10 @@ static netdev_tx_t mpi_start_xmit(struct sk_buff *skb, airo_print_err(dev->name, "%s: skb == NULL!",__func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } npacks = skb_queue_len (&ai->txq); if (npacks >= MAXTXQ - 1) { @@ -2127,6 +2131,10 @@ static netdev_tx_t airo_start_xmit(struct sk_buff *skb, airo_print_err(dev->name, "%s: skb == NULL!", __func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } /* Find a vacant FID */ for( i = 0; i < MAX_FIDS / 2 && (fids[i] & 0xffff0000); i++ ); @@ -2201,6 +2209,10 @@ static netdev_tx_t airo_start_xmit11(struct sk_buff *skb, airo_print_err(dev->name, "%s: skb == NULL!", __func__); return NETDEV_TX_OK; } + if (skb_padto(skb, ETH_ZLEN)) { + dev->stats.tx_dropped++; + return NETDEV_TX_OK; + } /* Find a vacant FID */ for( i = MAX_FIDS / 2; i < MAX_FIDS && (fids[i] & 0xffff0000); i++ ); |