V4L/DVB (8136): xc2028 unaligned access fixes
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c
index 30eb07b..4dd1d24 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 @@
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 @@
}
/* 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 @@
goto done;
+header:
+ tuner_err("Firmware header is incomplete!\n");
corrupt:
rc = -EINVAL;
tuner_err("Error: firmware file is corrupted!\n");