[PATCH 4.4 062/114] brcmfmac: Fix glom_skb leak in brcmf_sdiod_recv_chain

Greg Kroah-Hartman
2018-11-08T21:51:17Z

[ Upstream commit 5ea59db8a375216e6c915c5586f556766673b5a7 ]

An earlier change to this function (3bdae810721b) fixed a leak in the
case of an unsuccessful call to brcmf_sdiod_buffrw(). However, the
glom_skb buffer, used for emulating a scattering read, is never used
or referenced after its contents are copied into the destination
buffers, and therefore always needs to be freed by the end of the
function.

Fixes: 3bdae810721b ("brcmfmac: Fix glob_skb leak in brcmf_sdiod_recv_chain")
Fixes: a413e39a38573 ("brcmfmac: fix brcmf_sdcard_recv_chain() for host without sg support")
Cc: stable@vger.kernel.org # 4.9.x-
Signed-off-by: Peter S. Housel <housel@acm.org>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
index 91da67657f81..72e1796c8167 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
@@ -705,7 +705,7 @@ done:
int brcmf_sdiod_recv_chain(struct brcmf_sdio_dev *sdiodev,
struct sk_buff_head *pktq, uint totlen)
{
- struct sk_buff *glom_skb;
+ struct sk_buff *glom_skb = NULL;
struct sk_buff *skb;
u32 addr = sdiodev->sbwad;
int err = 0;
@@ -726,10 +726,8 @@ int brcmf_sdiod_recv_chain(struct brcmf_sdio_dev *sdiodev,
return -ENOMEM;
err = brcmf_sdiod_buffrw(sdiodev, SDIO_FUNC_2, false, addr,
glom_skb);
- if (err) {
- brcmu_pkt_buf_free_skb(glom_skb);
+ if (err)
goto done;
- }

skb_queue_walk(pktq, skb) {
memcpy(skb->data, glom_skb->data, skb->len);
@@ -740,6 +738,7 @@ int brcmf_sdiod_recv_chain(struct brcmf_sdio_dev *sdiodev,
pktq);

done:
+ brcmu_pkt_buf_free_skb(glom_skb);
return err;
}

--
2.17.1