From: Dan Carpenter <dan.carpenter@oracle.com>
To: Arend van Spriel <arend.vanspriel@broadcom.com>,
Franky Lin <frankyl@broadcom.com>
Cc: "Hante Meuleman" <hante.meuleman@broadcom.com>,
"Chi-Hsien Lin" <chi-hsien.lin@cypress.com>,
"Wright Feng" <wright.feng@cypress.com>,
"Kalle Valo" <kvalo@codeaurora.org>,
"Douglas Anderson" <dianders@chromium.org>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
"Rafał Miłecki" <rafal@milecki.pl>,
"Naveen Gupta" <naveen.gupta@cypress.com>,
linux-wireless@vger.kernel.org,
brcm80211-dev-list.pdl@broadcom.com,
brcm80211-dev-list@cypress.com, kernel-janitors@vger.kernel.org
Subject: [PATCH] brcmfmac: Fix use after free in brcmf_sdio_readframes()
Date: Tue, 3 Dec 2019 12:58:55 +0300 [thread overview]
Message-ID: <20191203095855.c4fradmsixgbq7mc@kili.mountain> (raw)
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 <dan.carpenter@oracle.com>
---
Static analysis. Not tested.
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 264ad63232f8..1dea0178832e 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -1935,6 +1935,7 @@ 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)) {
--
2.11.0
next reply other threads:[~2019-12-03 9:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 9:58 Dan Carpenter [this message]
2019-12-03 18:42 ` [PATCH] brcmfmac: Fix use after free in brcmf_sdio_readframes() Franky Lin
2019-12-18 18:58 ` Kalle Valo
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