bnx2x: fix possible panic under memory stress

While it is legal to kfree(NULL), it is not wise to use : put_page(virt_to_head_page(NULL)) BUG: unable to handle kernel paging request at ffffeba400000000 IP: [<ffffffffc01f5928>] virt_to_head_page+0x36/0x44 [bnx2x] Reported-by: Michel Lespinasse <[email protected]> Signed-off-by: Eric Dumazet <[email protected]> Cc: Ariel Elior <[email protected]> Fixes: d46d132 ("bnx2x: use netdev_alloc_frag()") Signed-off-by: David S. Miller <[email protected]>
chewitt · Jul 1, 2014 · 07b0f00 · 07b0f00
1 parent 7f50236
commit 07b0f00
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -797,7 +797,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 
 		return;
 	}
-	bnx2x_frag_free(fp, new_data);
+	if (new_data)
+		bnx2x_frag_free(fp, new_data);
 drop:
 	/* drop the packet and keep the buffer in the bin */
 	DP(NETIF_MSG_RX_STATUS,