solos: Check for rogue received packets

Sometimes there can be received packets with the size field set to 0xFFFF.
This seems to only occur after an FPGA or firmware upgrade.
This patch discards packets with an invalid size.

Signed-off-by: Nathan Williams <nathan@traverse.com.au>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c
index bfef8d255811..6c828347c9cc 100644
--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -671,6 +671,10 @@ void solos_bh(unsigned long card_arg)
                                 memcpy_fromio(header, RX_BUF(card, port), sizeof(*header));
 
                                 size = le16_to_cpu(header->size);
+                                if (size > (card->buffer_size - sizeof(*header))){
+                                        dev_warn(&card->dev->dev, "Invalid buffer size\n");
+                                        continue;
+                                }
 
                                 skb = alloc_skb(size + 1, GFP_ATOMIC);
                                 if (!skb) {