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ar71xx: check squashfs signature in TP-Link mtd parser

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SVN-Revision: 29446
This commit is contained in:
Gabor Juhos 2011-12-05 14:52:33 +00:00
parent 54c8d61b03
commit 3e7a6d182a
1 changed files with 31 additions and 1 deletions
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32
target/linux/ar71xx/files/drivers/mtd/tplinkpart.c
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@ -10,6 +10,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/magic.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@ -83,6 +84,26 @@ err:
return NULL;
}
static int tplink_check_squashfs_magic(struct mtd_info *mtd, size_t offset)
{
u32 magic;
size_t retlen;
int ret;
ret = mtd->read(mtd, offset, sizeof(magic), &retlen,
(unsigned char *) &magic);
if (ret)
return ret;
if (retlen != sizeof(magic))
return -EIO;
if (le32_to_cpu(magic) != SQUASHFS_MAGIC)
return -EINVAL;
return 0;
}
static int tplink_parse_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
@ -93,6 +114,7 @@ static int tplink_parse_partitions(struct mtd_info *master,
size_t offset;
size_t art_offset;
size_t rootfs_offset;
size_t squashfs_offset;
int ret;
nr_parts = TPLINK_NUM_PARTS;
@ -111,7 +133,15 @@ static int tplink_parse_partitions(struct mtd_info *master,
goto err_free_parts;
}
rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs);
squashfs_offset = offset + sizeof(struct tplink_fw_header) +
be32_to_cpu(header->kernel_len);
ret = tplink_check_squashfs_magic(master, squashfs_offset);
if (ret == 0)
rootfs_offset = squashfs_offset;
else
rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs);
art_offset = master->size - TPLINK_ART_LEN;
parts[0].name = "u-boot";