linux-kernel - [PATCH] xc2028 unaligned access fixes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <E1KAQPh-0001y2-I9@ZenIV.linux.org.uk>
Date:	Sun, 22 Jun 2008 15:19:29 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	mchehab@...radead.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] xc2028 unaligned access fixes


Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/media/common/tuners/tuner-xc2028.c |   25 ++++++++++++++-----------
 1 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c
index 0cbde17..cd7905a 100644
--- a/drivers/media/common/tuners/tuner-xc2028.c
+++ b/drivers/media/common/tuners/tuner-xc2028.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <media/tuner.h>
 #include <linux/mutex.h>
+#include <asm/unaligned.h>
 #include "tuner-i2c.h"
 #include "tuner-xc2028.h"
 #include "tuner-xc2028-types.h"
@@ -292,10 +293,10 @@ static int load_all_firmwares(struct dvb_frontend *fe)
 	name[sizeof(name) - 1] = 0;
 	p += sizeof(name) - 1;
 
-	priv->firm_version = le16_to_cpu(*(__u16 *) p);
+	priv->firm_version = get_unaligned_le16(p);
 	p += 2;
 
-	n_array = le16_to_cpu(*(__u16 *) p);
+	n_array = get_unaligned_le16(p);
 	p += 2;
 
 	tuner_info("Loading %d firmware images from %s, type: %s, ver %d.%d\n",
@@ -324,26 +325,26 @@ static int load_all_firmwares(struct dvb_frontend *fe)
 		}
 
 		/* Checks if there's enough bytes to read */
-		if (p + sizeof(type) + sizeof(id) + sizeof(size) > endp) {
-			tuner_err("Firmware header is incomplete!\n");
-			goto corrupt;
-		}
+		if (endp - p < sizeof(type) + sizeof(id) + sizeof(size))
+			goto header;
 
-		type = le32_to_cpu(*(__u32 *) p);
+		type = get_unaligned_le32(p);
 		p += sizeof(type);
 
-		id = le64_to_cpu(*(v4l2_std_id *) p);
+		id = get_unaligned_le64(p);
 		p += sizeof(id);
 
 		if (type & HAS_IF) {
-			int_freq = le16_to_cpu(*(__u16 *) p);
+			int_freq = get_unaligned_le16(p);
 			p += sizeof(int_freq);
+			if (endp - p < sizeof(size))
+				goto header;
 		}
 
-		size = le32_to_cpu(*(__u32 *) p);
+		size = get_unaligned_le32(p);
 		p += sizeof(size);
 
-		if ((!size) || (size + p > endp)) {
+		if (!size || size > endp - p) {
 			tuner_err("Firmware type ");
 			dump_firm_type(type);
 			printk("(%x), id %llx is corrupted "
@@ -382,6 +383,8 @@ static int load_all_firmwares(struct dvb_frontend *fe)
 
 	goto done;
 
+header:
+	tuner_err("Firmware header is incomplete!\n");
 corrupt:
 	rc = -EINVAL;
 	tuner_err("Error: firmware file is corrupted!\n");
-- 
1.5.3.GIT


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/