From: Heinrich Schuchardt Date: Tue, 17 May 2016 20:41:33 +0000 (+0200) Subject: i40e: avoid null pointer dereference X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cd956722167ba4fdba9c1ce3eed251b04ea2e10f;p=linux-beck.git i40e: avoid null pointer dereference In function i40e_debug_aq parameter desc is assumed to be possibly NULL. Do not dereference it before checking the value. Fixes: f905dd62be88 ("i40e/i40evf: add max buf len to aq debug print helper") Signed-off-by: Heinrich Schuchardt Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c index e447dc435464..bb63df854ab4 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_common.c +++ b/drivers/net/ethernet/intel/i40e/i40e_common.c @@ -297,13 +297,15 @@ void i40e_debug_aq(struct i40e_hw *hw, enum i40e_debug_mask mask, void *desc, void *buffer, u16 buf_len) { struct i40e_aq_desc *aq_desc = (struct i40e_aq_desc *)desc; - u16 len = le16_to_cpu(aq_desc->datalen); + u16 len; u8 *buf = (u8 *)buffer; u16 i = 0; if ((!(mask & hw->debug_mask)) || (desc == NULL)) return; + len = le16_to_cpu(aq_desc->datalen); + i40e_debug(hw, mask, "AQ CMD: opcode 0x%04X, flags 0x%04X, datalen 0x%04X, retval 0x%04X\n", le16_to_cpu(aq_desc->opcode),