linux-kernel - [PATCH] staging: wilc1000: fix infinite loop and out-of-bounds access

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Message-ID: <20180430125040.GA19050@embeddedor.com>
Date:   Mon, 30 Apr 2018 07:50:40 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Ajay Singh <ajay.kathat@...rochip.com>,
        Ganesh Krishna <ganesh.krishna@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] staging: wilc1000: fix infinite loop and out-of-bounds access

If i < slot_id is initially true then it will remain true. Also,
as i is being decremented it will end up accessing memory out of
bounds.

Fix this by incrementing *i* instead of decrementing it.

Addresses-Coverity-ID: 1468454 ("Infinite loop")
Fixes: faa657641081 ("staging: wilc1000: refactor scan() to free kmalloc
memory on failure cases")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---

BTW... at first sight it seems to me that variables slot_id
and i should be of type unsigned instead of signed.

 drivers/staging/wilc1000/wilc_wfi_cfgoperations.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
index 3ca0c97..67104e8 100644
--- a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
+++ b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
@@ -608,7 +608,7 @@ wilc_wfi_cfg_alloc_fill_ssid(struct cfg80211_scan_request *request,
 
 out_free:
 
-	for (i = 0; i < slot_id ; i--)
+	for (i = 0; i < slot_id; i++)
 		kfree(ntwk->net_info[i].ssid);
 
 	kfree(ntwk->net_info);
-- 
2.7.4