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Subject[PATCH 4.1 021/267] ath9k_htc: memory corruption calling set_bit()
Date
4.1-stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 191f1aeeb93bb58e56f4d1868294ae22f3f67d4e upstream.

In d8a2c51cdcae ('ath9k_htc: Use atomic operations for op_flags') we
changed things like this:

- if (priv->op_flags & OP_TSF_RESET) {
+ if (test_bit(OP_TSF_RESET, &priv->op_flags)) {

The problem is that test_bit() takes a bit number and not a mask. It
means that when we do:

set_bit(OP_TSF_RESET, &priv->op_flags);

Then it sets the (1 << 6) bit instead of the 6 bit so we are setting a
bit which is past the end of the unsigned long.

Fixes: d8a2c51cdcae ('ath9k_htc: Use atomic operations for op_flags')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/ath/ath9k/htc.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -440,9 +440,9 @@ static inline void ath9k_htc_stop_btcoex
}
#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */

-#define OP_BT_PRIORITY_DETECTED BIT(3)
-#define OP_BT_SCAN BIT(4)
-#define OP_TSF_RESET BIT(6)
+#define OP_BT_PRIORITY_DETECTED 3
+#define OP_BT_SCAN 4
+#define OP_TSF_RESET 6

enum htc_op_flags {
HTC_FWFLAG_NO_RMW,



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