2019-04-09 11:20:24

by Colin King

Subject: [PATCH] brcmfmac: fix leak of mypkt on error return path

From: Colin Ian King <[email protected]>

Currently if the call to brcmf_sdiod_set_backplane_window fails then
then error return path leaks mypkt. Fix this by returning by a new
error path labelled 'out' that calls brcmu_pkt_buf_free_skb to free
mypkt.

Addresses-Coverity: ("Resource Leak")
Fixes: a7c3aa1509e2 ("brcmfmac: Remove brcmf_sdiod_addrprep()")
Signed-off-by: Colin Ian King <[email protected]>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
index ec129864cc9c..f3d11e024e71 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -628,7 +628,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)

err = brcmf_sdiod_set_backplane_window(sdiodev, addr);
if (err)
- return err;
+ goto out;

addr &= SBSDIO_SB_OFT_ADDR_MASK;
addr |= SBSDIO_SB_ACCESS_2_4B_FLAG;
@@ -636,7 +636,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
if (!err)
err = brcmf_sdiod_skbuff_write(sdiodev, sdiodev->func2, addr,
mypkt);
-
+out:
brcmu_pkt_buf_free_skb(mypkt);

return err;
--
2.20.1

2019-04-09 11:33:27

by Dan Carpenter

Subject: Re: [PATCH] brcmfmac: fix leak of mypkt on error return path

On Tue, Apr 09, 2019 at 12:20:11PM +0100, Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> Currently if the call to brcmf_sdiod_set_backplane_window fails then
> then error return path leaks mypkt. Fix this by returning by a new
> error path labelled 'out' that calls brcmu_pkt_buf_free_skb to free
> mypkt.
>
> Addresses-Coverity: ("Resource Leak")
> Fixes: a7c3aa1509e2 ("brcmfmac: Remove brcmf_sdiod_addrprep()")
> Signed-off-by: Colin Ian King <[email protected]>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> index ec129864cc9c..f3d11e024e71 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> @@ -628,7 +628,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
>
> err = brcmf_sdiod_set_backplane_window(sdiodev, addr);
> if (err)
> - return err;
> + goto out;
>
> addr &= SBSDIO_SB_OFT_ADDR_MASK;
> addr |= SBSDIO_SB_ACCESS_2_4B_FLAG;
> @@ -636,7 +636,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
> if (!err)
^^^^
This is not required, btw.

> err = brcmf_sdiod_skbuff_write(sdiodev, sdiodev->func2, addr,
> mypkt);
> -
> +out:
> brcmu_pkt_buf_free_skb(mypkt);

regards,
dan carpenter

2019-04-09 11:35:39

by Colin King

Subject: Re: [PATCH] brcmfmac: fix leak of mypkt on error return path

On 09/04/2019 12:32, Dan Carpenter wrote:
> On Tue, Apr 09, 2019 at 12:20:11PM +0100, Colin King wrote:
>> From: Colin Ian King <[email protected]>
>>
>> Currently if the call to brcmf_sdiod_set_backplane_window fails then
>> then error return path leaks mypkt. Fix this by returning by a new
>> error path labelled 'out' that calls brcmu_pkt_buf_free_skb to free
>> mypkt.
>>
>> Addresses-Coverity: ("Resource Leak")
>> Fixes: a7c3aa1509e2 ("brcmfmac: Remove brcmf_sdiod_addrprep()")
>> Signed-off-by: Colin Ian King <[email protected]>
>> ---
>> drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>> index ec129864cc9c..f3d11e024e71 100644
>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>> @@ -628,7 +628,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
>>
>> err = brcmf_sdiod_set_backplane_window(sdiodev, addr);
>> if (err)
>> - return err;
>> + goto out;
>>
>> addr &= SBSDIO_SB_OFT_ADDR_MASK;
>> addr |= SBSDIO_SB_ACCESS_2_4B_FLAG;
>> @@ -636,7 +636,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
>> if (!err)
> ^^^^
> This is not required, btw.

Good point.

>
>> err = brcmf_sdiod_skbuff_write(sdiodev, sdiodev->func2, addr,
>> mypkt);
>> -
>> +out:
>> brcmu_pkt_buf_free_skb(mypkt);
>
> regards,
> dan carpenter
>

2019-04-09 11:40:50

by Arend Van Spriel

Subject: Re: [PATCH] brcmfmac: fix leak of mypkt on error return path

On 4/9/2019 1:20 PM, Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> Currently if the call to brcmf_sdiod_set_backplane_window fails then
> then error return path leaks mypkt. Fix this by returning by a new
> error path labelled 'out' that calls brcmu_pkt_buf_free_skb to free
> mypkt.
>
> Addresses-Coverity: ("Resource Leak")
> Fixes: a7c3aa1509e2 ("brcmfmac: Remove brcmf_sdiod_addrprep()")
> Signed-off-by: Colin Ian King <[email protected]>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> index ec129864cc9c..f3d11e024e71 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
> @@ -628,7 +628,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
>
> err = brcmf_sdiod_set_backplane_window(sdiodev, addr);
> if (err)
> - return err;
> + goto out;

Actually seems you can just get rid of the if statement entirely as
below it skips brcmf_sdiod_skbuff_write() when an error occurred so no
label is necessary.

Regards,
Arend

> addr &= SBSDIO_SB_OFT_ADDR_MASK;
> addr |= SBSDIO_SB_ACCESS_2_4B_FLAG;
> @@ -636,7 +636,7 @@ int brcmf_sdiod_send_buf(struct brcmf_sdio_dev *sdiodev, u8 *buf, uint nbytes)
> if (!err)
> err = brcmf_sdiod_skbuff_write(sdiodev, sdiodev->func2, addr,
> mypkt);
> -
> +out:
> brcmu_pkt_buf_free_skb(mypkt);
>
> return err;
>