EljakimHerrewijnen/Openwrt
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kernel: mtdsplit_uimage: use separated buffer for reading data

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We shouldn't read data directly into the header struct, as some devices
(e.g. Edimax) need more bytes due to some extra header.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 44414
This commit is contained in:
Rafał Miłecki 2015-02-12 07:44:34 +00:00
parent 5673e0b703
commit 072759ff39
1 changed files with 16 additions and 18 deletions
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34
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
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@ -49,15 +49,15 @@ struct uimage_header {
static int
read_uimage_header(struct mtd_info *mtd, size_t offset,
struct uimage_header *header)
u_char *buf)
{
struct uimage_header *header;
size_t header_len;
size_t retlen;
int ret;
header_len = sizeof(*header);
ret = mtd_read(mtd, offset, header_len, &retlen,
(unsigned char *) header);
ret = mtd_read(mtd, offset, header_len, &retlen, buf);
if (ret) {
pr_debug("read error in \"%s\"\n", mtd->name);
return ret;
@ -83,6 +83,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
ssize_t (*find_header)(u_char *buf, size_t len))
{
struct mtd_partition *parts;
u_char *buf;
struct uimage_header *header;
int nr_parts;
size_t offset;
@ -98,8 +99,8 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (!parts)
return -ENOMEM;
header = vmalloc(sizeof(*header));
if (!header) {
buf = vmalloc(sizeof(*header));
if (!buf) {
ret = -ENOMEM;
goto err_free_parts;
}
@ -108,20 +109,17 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
for (offset = 0; offset < master->size; offset += master->erasesize) {
uimage_size = 0;
ret = read_uimage_header(master, offset, header);
ret = read_uimage_header(master, offset, buf);
if (ret)
continue;
ret = find_header((u_char *)header, sizeof(*header));
ret = find_header(buf, sizeof(*buf));
if (ret < 0) {
pr_debug("no valid uImage found in \"%s\" at offset %llx\n",
master->name, (unsigned long long) offset);
continue;
}
if (ret > 0) {
pr_warn("extra header offsets are not supported yet\n");
continue;
}
header = (struct uimage_header *)(buf + ret);
uimage_size = sizeof(*header) + be32_to_cpu(header->ih_size);
if ((offset + uimage_size) > master->size) {
@ -135,7 +133,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (uimage_size == 0) {
pr_debug("no uImage found in \"%s\"\n", master->name);
ret = -ENODEV;
goto err_free_header;
goto err_free_buf;
}
uimage_offset = offset;
@ -152,7 +150,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (ret) {
pr_debug("no rootfs after uImage in \"%s\"\n",
master->name);
goto err_free_header;
goto err_free_buf;
}
rootfs_size = master->size - rootfs_offset;
@ -166,7 +164,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (ret) {
pr_debug("no rootfs before uImage in \"%s\"\n",
master->name);
goto err_free_header;
goto err_free_buf;
}
rootfs_offset = 0;
@ -176,7 +174,7 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
if (rootfs_size == 0) {
pr_debug("no rootfs found in \"%s\"\n", master->name);
ret = -ENODEV;
goto err_free_header;
goto err_free_buf;
}
parts[uimage_part].name = KERNEL_PART_NAME;
@ -187,13 +185,13 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
parts[rf_part].offset = rootfs_offset;
parts[rf_part].size = rootfs_size;
vfree(header);
vfree(buf);
*pparts = parts;
return nr_parts;
err_free_header:
vfree(header);
err_free_buf:
vfree(buf);
err_free_parts:
kfree(parts);