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From: Maya Erez <qca_merez@qca.qualcomm.com>
To: Kalle Valo <kvalo@codeaurora.org>
Cc: Dedy Lansky <qca_dlansky@qualcomm.com>,
	linux-wireless@vger.kernel.org, wil6210@qca.qualcomm.com,
	Maya Erez <qca_merez@qca.qualcomm.com>
Subject: [PATCH 08/11] wil6210: fix memory access violation in wil_memcpy_from/toio_32
Date: Wed,  5 Apr 2017 14:58:11 +0300
Message-ID: <1491393494-11816-9-git-send-email-qca_merez@qca.qualcomm.com> (raw)
In-Reply-To: <1491393494-11816-1-git-send-email-qca_merez@qca.qualcomm.com>

From: Dedy Lansky <qca_dlansky@qca.qualcomm.com>

In case count is not multiple of 4, there is a read access in
wil_memcpy_toio_32() from outside src buffer boundary.
In wil_memcpy_fromio_32(), in case count is not multiple of 4, there is
a write access to outside dst io memory boundary.

Fix these issues with proper handling of the last 1 to 4 copied bytes.

Signed-off-by: Dedy Lansky <qca_dlansky@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
---
 drivers/net/wireless/ath/wil6210/main.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c
index 9aa81ce..439d27c 100644
--- a/drivers/net/wireless/ath/wil6210/main.c
+++ b/drivers/net/wireless/ath/wil6210/main.c
@@ -130,9 +130,15 @@ void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
 	u32 *d = dst;
 	const volatile u32 __iomem *s = src;
 
-	/* size_t is unsigned, if (count%4 != 0) it will wrap */
-	for (count += 4; count > 4; count -= 4)
+	for (; count >= 4; count -= 4)
 		*d++ = __raw_readl(s++);
+
+	if (unlikely(count)) {
+		/* count can be 1..3 */
+		u32 tmp = __raw_readl(s);
+
+		memcpy(d, &tmp, count);
+	}
 }
 
 void wil_memcpy_fromio_halp_vote(struct wil6210_priv *wil, void *dst,
@@ -149,8 +155,16 @@ void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
 	volatile u32 __iomem *d = dst;
 	const u32 *s = src;
 
-	for (count += 4; count > 4; count -= 4)
+	for (; count >= 4; count -= 4)
 		__raw_writel(*s++, d++);
+
+	if (unlikely(count)) {
+		/* count can be 1..3 */
+		u32 tmp = 0;
+
+		memcpy(&tmp, s, count);
+		__raw_writel(tmp, d);
+	}
 }
 
 void wil_memcpy_toio_halp_vote(struct wil6210_priv *wil,
-- 
1.9.1

  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-05 11:58 [PATCH 00/11] wil6210 patches Maya Erez
2017-04-05 11:58 ` [PATCH 02/11] wil6210: restore power save state after internal FW reset Maya Erez
2017-04-05 11:58 ` [PATCH 03/11] wil6210: support 8KB RX buffers Maya Erez
2017-04-05 11:58 ` [PATCH 04/11] wil6210: align to latest auto generated wmi.h Maya Erez
2017-04-05 11:58 ` [PATCH 05/11] wil6210: fix protection against connections during reset Maya Erez
2017-04-05 11:58 ` [PATCH 06/11] wil6210: protect against sporadic interrupt during suspend flow Maya Erez
2017-04-05 11:58 ` [PATCH 07/11] wil6210: fix check for sparrow D0 FW file Maya Erez
2017-04-05 11:58 ` Maya Erez [this message]
2017-04-05 11:58 ` [PATCH 09/11] wil6210: remove HALP voting in debugfs ioblob Maya Erez
2017-04-05 11:58 ` [PATCH 10/11] wil6210: fix array out of bounds access in pmc Maya Erez
2017-04-05 11:58 ` [PATCH 11/11] wil6210: prevent access to 11AD device if resume fails Maya Erez
2017-04-05 11:58 [PATCH 01/11] wil6210: fix sequence for scan-abort during reset Maya Erez
2017-04-13 12:47 ` [01/11] " Kalle Valo

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