From: Pontus Fuchs <[email protected]> A short or malformed vendor command buffer could cause reads outside the command buffer.
Cc: [email protected] # v3.19 Signed-off-by: Pontus Fuchs <[email protected]> [[email protected]: slightly modified debug trace output] Signed-off-by: Arend van Spriel <[email protected]> --- drivers/net/wireless/brcm80211/brcmfmac/vendor.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/brcm80211/brcmfmac/vendor.c b/drivers/net/wireless/brcm80211/brcmfmac/vendor.c index 50cdf70..8eff275 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/vendor.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/vendor.c @@ -39,13 +39,22 @@ static int brcmf_cfg80211_vndr_cmds_dcmd_handler(struct wiphy *wiphy, void *dcmd_buf = NULL, *wr_pointer; u16 msglen, maxmsglen = PAGE_SIZE - 0x100; - brcmf_dbg(TRACE, "cmd %x set %d len %d\n", cmdhdr->cmd, cmdhdr->set, - cmdhdr->len); + if (len < sizeof(*cmdhdr)) { + brcmf_err("vendor command too short: %d\n", len); + return -EINVAL; + } vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev); ifp = vif->ifp; - len -= sizeof(struct brcmf_vndr_dcmd_hdr); + brcmf_dbg(TRACE, "ifidx=%d, cmd=%d\n", ifp->ifidx, cmdhdr->cmd); + + if (cmdhdr->offset > len) { + brcmf_err("bad buffer offset %d > %d\n", cmdhdr->offset, len); + return -EINVAL; + } + + len -= cmdhdr->offset; ret_len = cmdhdr->len; if (ret_len > 0 || len > 0) { if (len > BRCMF_DCMD_MAXLEN) { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
