[PATCH AUTOSEL for 4.9 080/281] ath5k: fix memory leak on buf on failed eeprom read

[Sasha Levin]

From: Colin Ian King <colin.k...@canonical.com>

[ Upstream commit 8fed6823e06e43ee9cf7c0ffecec2f9111ce6201 ]

The AR5K_EEPROM_READ macro returns with -EIO if a read error
occurs causing a memory leak on the allocated buffer buf. Fix
this by explicitly calling ath5k_hw_nvram_read and exiting on
the via the freebuf label that performs the necessary free'ing
of buf when a read error occurs.

Detected by CoverityScan, CID#1248782 ("Resource Leak")

Signed-off-by: Colin Ian King <colin.k...@canonical.com>
Signed-off-by: Kalle Valo <kv...@qca.qualcomm.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/wireless/ath/ath5k/debug.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath5k/debug.c 
b/drivers/net/wireless/ath/ath5k/debug.c
index 4f8d9ed04f5e..4a1054408f1a 100644
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -939,7 +939,10 @@ static int open_file_eeprom(struct inode *inode, struct 
file *file)
        }
 
        for (i = 0; i < eesize; ++i) {
-               AR5K_EEPROM_READ(i, val);
+               if (!ath5k_hw_nvram_read(ah, i, &val)) {
+                       ret = -EIO;
+                       goto freebuf;
+               }
                buf[i] = val;
        }
 
-- 
2.14.1