On 03/06/15 16:18, Arend van Spriel wrote:
From: Pontus Fuchs<pontusf@xxxxxxxxxxxx>
A short or malformed vendor command buffer could cause reads outside
the command buffer.
Cc: stable@xxxxxxxxxxxxxxx # v3.19
Signed-off-by: Pontus Fuchs<pontusf@xxxxxxxxxxxx>
[arend@xxxxxxxxxxxx: slightly modified debug trace output]
Signed-off-by: Arend van Spriel<arend@xxxxxxxxxxxx>
---
Hi Kalle,
Forgot to mention this is for v4.0 kernel.
Regards,
Arend
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) {
--
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