linux-kernel - [2.6 patch] drivers/net/wireless/libertas/fw.c: fix use-before-check

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Message-ID: <464DDD29.3000009@redhat.com>
Date:	Sat, 19 May 2007 01:06:49 +0800
From:	Eugene Teo <eteo@...hat.com>
To:	linux-kernel@...r.kernel.org
CC:	jeff@...zik.org
Subject: [2.6 patch] drivers/net/wireless/libertas/fw.c: fix use-before-check

NULL checks should be performed before the dereference.

Spotted by the Coverity checker.

Signed-off-by: Eugene Teo <eteo@...hat.com>

diff --git a/drivers/net/wireless/libertas/fw.c b/drivers/net/wireless/libertas/fw.c
index 441123c..5c63c9b 100644
--- a/drivers/net/wireless/libertas/fw.c
+++ b/drivers/net/wireless/libertas/fw.c
@@ -333,18 +333,22 @@ static void command_timer_fn(unsigned long data)
        unsigned long flags;

        ptempnode = adapter->cur_cmd;
+       if (ptempnode == NULL) {
+               lbs_pr_debug(1, "PTempnode Empty\n");
+               return;
+       }
+
        cmd = (struct cmd_ds_command *)ptempnode->bufvirtualaddr;
+       if (!cmd) {
+               lbs_pr_debug(1, "cmd is NULL\n");
+               return;
+       }

        lbs_pr_info("command_timer_fn fired (%x)\n", cmd->command);

        if (!adapter->fw_ready)
                return;

-       if (ptempnode == NULL) {
-               lbs_pr_debug(1, "PTempnode Empty\n");
-               return;
-       }
-
        spin_lock_irqsave(&adapter->driver_lock, flags);
        adapter->cur_cmd = NULL;
        spin_unlock_irqrestore(&adapter->driver_lock, flags);
-
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