ath5k/phy.c: fix negative array index

Author: Adrian Bunk <bunk@kernel.org>

This patch fixes a negative array index spotted by the Coverity checker.

Changes-licensed-under: ISC

Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath5k/phy.c b/drivers/net/wireless/ath5k/phy.c
index 248c0f545f24..405195ffb24d 100644
--- a/drivers/net/wireless/ath5k/phy.c
+++ b/drivers/net/wireless/ath5k/phy.c
@@ -1178,6 +1178,9 @@ static int ath5k_hw_rf5112_rfregs(struct ath5k_hw *ah,
                         (channel->center_freq >= 5260 ? 1 :
                             (channel->center_freq > 4000 ? 0 : -1)));
 
+                if (obdb == -1)
+                        return -EINVAL;
+
                 if (!ath5k_hw_rfregs_op(rf, ah->ah_offset[6],
                                 ee->ee_ob[ee_mode][obdb], 3, 279, 0, true))
                         return -EINVAL;