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| author | Szymon Heidrich <szymon.heidrich@gmail.com> | 2023-01-14 19:23:26 +0100 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-01-17 11:50:42 +0100 |
| commit | ecf7cf8efb59789e2b21d2f9ab926142579092b2 (patch) | |
| tree | 142c803ebea653fbb70f96e5637266556cd5b494 /drivers | |
| parent | 87b93b678e95c7d93fe6a55b0e0fbda26d8c7760 (diff) | |
| download | linux-ecf7cf8efb59789e2b21d2f9ab926142579092b2.tar.gz linux-ecf7cf8efb59789e2b21d2f9ab926142579092b2.tar.bz2 linux-ecf7cf8efb59789e2b21d2f9ab926142579092b2.zip | |
net: usb: sr9700: Handle negative len
Packet len computed as difference of length word extracted from
skb data and four may result in a negative value. In such case
processing of the buffer should be interrupted rather than
setting sr_skb->len to an unexpectedly large value (due to cast
from signed to unsigned integer) and passing sr_skb to
usbnet_skb_return.
Fixes: e9da0b56fe27 ("sr9700: sanity check for packet length")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Link: https://lore.kernel.org/r/20230114182326.30479-1-szymon.heidrich@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/sr9700.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c index 5a53e63d33a6..3164451e1010 100644 --- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -413,7 +413,7 @@ static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb) /* ignore the CRC length */ len = (skb->data[1] | (skb->data[2] << 8)) - 4; - if (len > ETH_FRAME_LEN || len > skb->len) + if (len > ETH_FRAME_LEN || len > skb->len || len < 0) return 0; /* the last packet of current skb */ |