diff options
| author | Arend van Spriel <arend@broadcom.com> | 2013-04-03 12:40:28 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2013-04-03 21:07:03 +0200 |
| commit | aeecc574a428a116936cadcea06b47cffad16ba1 (patch) | |
| tree | b29bc67392aa023f03ff3e36af0a25f15f3c00b8 /drivers | |
| parent | brcmfmac: minor optimization of brcmf_sdbrcm_txpkt() function (diff) | |
| download | linux-aeecc574a428a116936cadcea06b47cffad16ba1.tar.xz linux-aeecc574a428a116936cadcea06b47cffad16ba1.zip | |
brcmfmac: use skb_cow() in brcmf_sdbrcm_txpkt() to assure alignment
In brcmf_sdbrcm_txpkt() a new packet is allocated and used to transmit
to firmware freeing up the original packet. However, that packet is
still referenced in firmware-signalling so this would result in a
double free. Using skb_cow() avoids this as the packet reference is
unchanged.
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Piotr Haber <phaber@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c | 25 |
1 files changed, 6 insertions, 19 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c index 4fa19b9fd8d4..f5f04ba65e8c 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c @@ -1781,7 +1781,6 @@ static int brcmf_sdbrcm_txpkt(struct brcmf_sdio *bus, struct sk_buff *pkt, u8 *frame; u16 len, pad = 0; u32 swheader; - struct sk_buff *new; int i; brcmf_dbg(TRACE, "Enter\n"); @@ -1795,26 +1794,14 @@ static int brcmf_sdbrcm_txpkt(struct brcmf_sdio *bus, struct sk_buff *pkt, brcmf_dbg(INFO, "insufficient headroom %d for %d pad\n", skb_headroom(pkt), pad); bus->sdiodev->bus_if->tx_realloc++; - new = brcmu_pkt_buf_get_skb(pkt->len + BRCMF_SDALIGN); - if (!new) { - brcmf_err("couldn't allocate new %d-byte packet\n", - pkt->len + BRCMF_SDALIGN); - ret = -ENOMEM; + ret = skb_cow(pkt, BRCMF_SDALIGN); + if (ret) goto done; - } - - pkt_align(new, pkt->len, BRCMF_SDALIGN); - memcpy(new->data, pkt->data, pkt->len); - brcmu_pkt_buf_free_skb(pkt); - pkt = new; - frame = (u8 *) (pkt->data); - /* precondition: (frame % BRCMF_SDALIGN) == 0) */ - pad = 0; - } else { - skb_push(pkt, pad); - frame = (u8 *) (pkt->data); - memset(frame + SDPCM_HDRLEN, 0, pad); + pad = ((unsigned long)frame % BRCMF_SDALIGN); } + skb_push(pkt, pad); + frame = (u8 *) (pkt->data); + memset(frame, 0, pad + SDPCM_HDRLEN); } /* precondition: pad < BRCMF_SDALIGN */ |