From 708567e0723f3a217286c2b60805af6de360ec50 Mon Sep 17 00:00:00 2001 From: Samuel Ortiz Date: Fri, 16 Oct 2009 13:18:55 +0800 Subject: [PATCH] iwmc3200wifi: Check for cmd pointer before dereferencing it The wifi_if_wrapper notification handling code uses a cmd pointer without checking if it's valid or not. We're dereferencing it because we assume that we only get to that point if there was a pending command for us. That's not always true, so we'd better check. Signed-off-by: Samuel Ortiz Signed-off-by: Zhu Yi Signed-off-by: John W. Linville --- drivers/net/wireless/iwmc3200wifi/rx.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c index 225b1d3b2735..648f84a83705 100644 --- a/drivers/net/wireless/iwmc3200wifi/rx.c +++ b/drivers/net/wireless/iwmc3200wifi/rx.c @@ -1057,8 +1057,14 @@ static int iwm_ntf_wifi_if_wrapper(struct iwm_priv *iwm, u8 *buf, unsigned long buf_size, struct iwm_wifi_cmd *cmd) { - struct iwm_umac_wifi_if *hdr = - (struct iwm_umac_wifi_if *)cmd->buf.payload; + struct iwm_umac_wifi_if *hdr; + + if (cmd == NULL) { + IWM_ERR(iwm, "Couldn't find expected wifi command\n"); + return -EINVAL; + } + + hdr = (struct iwm_umac_wifi_if *)cmd->buf.payload; IWM_DBG_NTF(iwm, DBG, "WIFI_IF_WRAPPER cmd is delivered to UMAC: " "oid is 0x%x\n", hdr->oid); -- 2.20.1