This is a note to let you know that I've just added the patch titled
wifi: brcmfmac: Adjust n_channels usage for __counted_by
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-brcmfmac-adjust-n_channels-usage-for-__counted_.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0d12eb9ea7f6c5d195ac33ddb385ae9eefa4b699
Author: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Fri Jan 26 14:31:53 2024 -0800
wifi: brcmfmac: Adjust n_channels usage for __counted_by
[ Upstream commit 5bdda0048c8d1bbe2019513b2d6200cc0d09c7bd ]
After commit e3eac9f32ec0 ("wifi: cfg80211: Annotate struct
cfg80211_scan_request with __counted_by"), the compiler may enforce
dynamic array indexing of req->channels to stay below n_channels. As a
result, n_channels needs to be increased _before_ accessing the newly
added array index. Increment it first, then use "i" for the prior index.
Solves this warning in the coming GCC that has __counted_by support:
../drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c: In function 'brcmf_internal_escan_add_info':
../drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:3783:46: warning: operation on 'req->
n_channels' may be undefined [-Wsequence-point]
3783 | req->channels[req->n_channels++] = chan;
| ~~~~~~~~~~~~~~~^~
Fixes: e3eac9f32ec0 ("wifi: cfg80211: Annotate struct cfg80211_scan_request with __counted_by")
Cc: Arend van Spriel <aspriel@xxxxxxxxx>
Cc: Franky Lin <franky.lin@xxxxxxxxxxxx>
Cc: Hante Meuleman <hante.meuleman@xxxxxxxxxxxx>
Cc: Kalle Valo <kvalo@xxxxxxxxxx>
Cc: Chi-hsien Lin <chi-hsien.lin@xxxxxxxxxxxx>
Cc: Ian Lin <ian.lin@xxxxxxxxxxxx>
Cc: Johannes Berg <johannes.berg@xxxxxxxxx>
Cc: Wright Feng <wright.feng@xxxxxxxxxxx>
Cc: Hector Martin <marcan@xxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: brcm80211-dev-list.pdl@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://msgid.link/20240126223150.work.548-kees@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 2a90bb24ba77..6049f9a761d9 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -3780,8 +3780,10 @@ static int brcmf_internal_escan_add_info(struct cfg80211_scan_request *req,
if (req->channels[i] == chan)
break;
}
- if (i == req->n_channels)
- req->channels[req->n_channels++] = chan;
+ if (i == req->n_channels) {
+ req->n_channels++;
+ req->channels[i] = chan;
+ }
for (i = 0; i < req->n_ssids; i++) {
if (req->ssids[i].ssid_len == ssid_len &&
