[PATCH] ath5k: fix memory leak on buf on failed eeprom read

[PATCH] ath5k: fix memory leak on buf on failed eeprom read

[Colin King]

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

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.king@canonical.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 d068df520e7a..bd7f6d7b199e 100644
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -938,7 +938,10 @@ 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;
 	}
 
-- 
2.11.0

Re: ath5k: fix memory leak on buf on failed eeprom read

[Kalle Valo]

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

Patch applied to ath-next branch of ath.git, thanks.

8fed6823e06e ath5k: fix memory leak on buf on failed eeprom read

-- 
https://patchwork.kernel.org/patch/9709935/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches