linux-kernel - [70/89] airo: fix setting zero length WEP key

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Date:	Tue, 30 Mar 2010 15:58:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Williams <dcbw@...hat.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [70/89] airo: fix setting zero length WEP key

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Stanislaw Gruszka <sgruszka@...hat.com>

commit f09c256375c7cf1e112b8ef6306cdd313490d7c0 upstream.

Patch prevents call set_wep_key() with zero key length. That fix long
standing regression since commit c0380693520b1a1e4f756799a0edc379378b462a
"airo: clean up WEP key operations". Additionally print call trace when
someone will try to use improper parameters, and remove key.len = 0
assignment, because it is in not possible code path.

Reported-by: Chris Siebenmann <cks-rhbugzilla@...toronto.edu>
Bisected-by: Chris Siebenmann <cks-rhbugzilla@...toronto.edu>
Tested-by: Chris Siebenmann <cks@...toronto.edu>
Cc: Dan Williams <dcbw@...hat.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/airo.c |   34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -5249,11 +5249,7 @@ static int set_wep_key(struct airo_info
 	WepKeyRid wkr;
 	int rc;
 
-	if (keylen == 0) {
-		airo_print_err(ai->dev->name, "%s: key length to set was zero",
-			       __func__);
-		return -1;
-	}
+	WARN_ON(keylen == 0);
 
 	memset(&wkr, 0, sizeof(wkr));
 	wkr.len = cpu_to_le16(sizeof(wkr));
@@ -6399,11 +6395,7 @@ static int airo_set_encode(struct net_de
 		if (dwrq->length > MIN_KEY_SIZE)
 			key.len = MAX_KEY_SIZE;
 		else
-			if (dwrq->length > 0)
-				key.len = MIN_KEY_SIZE;
-			else
-				/* Disable the key */
-				key.len = 0;
+			key.len = MIN_KEY_SIZE;
 		/* Check if the key is not marked as invalid */
 		if(!(dwrq->flags & IW_ENCODE_NOKEY)) {
 			/* Cleanup */
@@ -6584,12 +6576,22 @@ static int airo_set_encodeext(struct net
 		default:
 			return -EINVAL;
 		}
-		/* Send the key to the card */
-		rc = set_wep_key(local, idx, key.key, key.len, perm, 1);
-		if (rc < 0) {
-			airo_print_err(local->dev->name, "failed to set WEP key"
-			               " at index %d: %d.", idx, rc);
-			return rc;
+		if (key.len == 0) {
+			rc = set_wep_tx_idx(local, idx, perm, 1);
+			if (rc < 0) {
+				airo_print_err(local->dev->name,
+					       "failed to set WEP transmit index to %d: %d.",
+					       idx, rc);
+				return rc;
+			}
+		} else {
+			rc = set_wep_key(local, idx, key.key, key.len, perm, 1);
+			if (rc < 0) {
+				airo_print_err(local->dev->name,
+					       "failed to set WEP key at index %d: %d.",
+					       idx, rc);
+				return rc;
+			}
 		}
 	}
 


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