Thread (174 messages) 174 messages, 5 authors, 2020-02-28
STALE2322d REVIEWED: 1 (0M)

[PATCH 4.9 024/165] brcmfmac: Fix use after free in brcmf_sdio_readframes()

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2020-02-27 13:46:05
Also in: lkml
Subsystem: broadcom brcm80211 ieee802.11 wireless drivers, the rest · Maintainers: Arend van Spriel, Linus Torvalds

From: Dan Carpenter <redacted>

[ Upstream commit 216b44000ada87a63891a8214c347e05a4aea8fe ]

The brcmu_pkt_buf_free_skb() function frees "pkt" so it leads to a
static checker warning:

    drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:1974 brcmf_sdio_readframes()
    error: dereferencing freed memory 'pkt'

It looks like there was supposed to be a continue after we free "pkt".

Fixes: 4754fceeb9a6 ("brcmfmac: streamline SDIO read frame routine")
Signed-off-by: Dan Carpenter <redacted>
Acked-by: Franky Lin <redacted>
Signed-off-by: Kalle Valo <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 1 +
 1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index de52d826eb248..998a4bd6db78a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -1921,6 +1921,7 @@ static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
 					       BRCMF_SDIO_FT_NORMAL)) {
 				rd->len = 0;
 				brcmu_pkt_buf_free_skb(pkt);
+				continue;
 			}
 			bus->sdcnt.rx_readahead_cnt++;
 			if (rd->len != roundup(rd_new.len, 16)) {
-- 
2.20.1


Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help