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brcmfmac: Fix use after free in brcmf_sdio_readframes()

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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: 4754fceeb9 ("brcmfmac: streamline SDIO read frame routine")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dan Carpenter 2019-12-03 12:58:55 +03:00 • committed by Kalle Valo
parent 960da557f4
commit 216b44000a
1 changed files with 1 additions and 0 deletions
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1
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
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@ -1935,6 +1935,7 @@ static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
BRCMF_SDIO_FT_NORMAL)) { BRCMF_SDIO_FT_NORMAL)) {
rd->len = 0; rd->len = 0;
brcmu_pkt_buf_free_skb(pkt); brcmu_pkt_buf_free_skb(pkt);
continue;
} }
bus->sdcnt.rx_readahead_cnt++; bus->sdcnt.rx_readahead_cnt++;
if (rd->len != roundup(rd_new.len, 16)) { if (rd->len != roundup(rd_new.len, 16)) {