From: Dan Carpenter <dan.carpenter@oracle.com> To: Larry Finger <Larry.Finger@lwfinger.net> Cc: Kalle Valo <kvalo@codeaurora.org>, linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org, kernel-janitors@vger.kernel.org Subject: [PATCH 1/2] b43legacy: fix a lower bounds test Date: Wed, 6 Oct 2021 10:35:42 +0300 [thread overview] Message-ID: <20211006073542.GD8404@kili> (raw) The problem is that "channel" is an unsigned int, when it's less 5 the value of "channel - 5" is not a negative number as one would expect but is very high positive value instead. This means that "start" becomes a very high positive value. The result of that is that we never enter the "for (i = start; i <= end; i++) {" loop. Instead of storing the result from b43legacy_radio_aci_detect() it just uses zero. Fixes: 75388acd0cd8 ("[B43LEGACY]: add mac80211-based driver for legacy BCM43xx devices") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- This fix is correct, but making dead code go live can sometimes expose bugs which were previously hiding and is always carries a slight risk. drivers/net/wireless/broadcom/b43legacy/radio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/broadcom/b43legacy/radio.c b/drivers/net/wireless/broadcom/b43legacy/radio.c index 06891b4f837b..fdf78c10a05c 100644 --- a/drivers/net/wireless/broadcom/b43legacy/radio.c +++ b/drivers/net/wireless/broadcom/b43legacy/radio.c @@ -283,7 +283,7 @@ u8 b43legacy_radio_aci_scan(struct b43legacy_wldev *dev) & 0x7FFF); b43legacy_set_all_gains(dev, 3, 8, 1); - start = (channel - 5 > 0) ? channel - 5 : 1; + start = (channel > 5) ? channel - 5 : 1; end = (channel + 5 < 14) ? channel + 5 : 13; for (i = start; i <= end; i++) { -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com> To: Larry Finger <Larry.Finger@lwfinger.net> Cc: Kalle Valo <kvalo@codeaurora.org>, linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org, kernel-janitors@vger.kernel.org Subject: [PATCH 1/2] b43legacy: fix a lower bounds test Date: Wed, 6 Oct 2021 10:35:42 +0300 [thread overview] Message-ID: <20211006073542.GD8404@kili> (raw) The problem is that "channel" is an unsigned int, when it's less 5 the value of "channel - 5" is not a negative number as one would expect but is very high positive value instead. This means that "start" becomes a very high positive value. The result of that is that we never enter the "for (i = start; i <= end; i++) {" loop. Instead of storing the result from b43legacy_radio_aci_detect() it just uses zero. Fixes: 75388acd0cd8 ("[B43LEGACY]: add mac80211-based driver for legacy BCM43xx devices") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- This fix is correct, but making dead code go live can sometimes expose bugs which were previously hiding and is always carries a slight risk. drivers/net/wireless/broadcom/b43legacy/radio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/broadcom/b43legacy/radio.c b/drivers/net/wireless/broadcom/b43legacy/radio.c index 06891b4f837b..fdf78c10a05c 100644 --- a/drivers/net/wireless/broadcom/b43legacy/radio.c +++ b/drivers/net/wireless/broadcom/b43legacy/radio.c @@ -283,7 +283,7 @@ u8 b43legacy_radio_aci_scan(struct b43legacy_wldev *dev) & 0x7FFF); b43legacy_set_all_gains(dev, 3, 8, 1); - start = (channel - 5 > 0) ? channel - 5 : 1; + start = (channel > 5) ? channel - 5 : 1; end = (channel + 5 < 14) ? channel + 5 : 13; for (i = start; i <= end; i++) { -- 2.20.1 _______________________________________________ b43-dev mailing list b43-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/b43-dev
next reply other threads:[~2021-10-06 7:36 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-06 7:35 Dan Carpenter [this message] 2021-10-06 7:35 ` [PATCH 1/2] b43legacy: fix a lower bounds test Dan Carpenter 2021-10-06 7:36 ` [PATCH 2/2] b43: " Dan Carpenter 2021-10-06 7:36 ` Dan Carpenter 2021-10-06 16:13 ` Michael Büsch 2021-10-06 16:13 ` Michael Büsch 2021-10-06 16:13 ` [PATCH 1/2] b43legacy: " Michael Büsch 2021-10-06 16:13 ` Michael Büsch 2021-10-11 6:09 ` Kalle Valo 2021-10-11 6:09 ` Kalle Valo
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