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generic: make mtdsplit-tplink.c honor rootfs offset

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The splitter ignored the rootfs offset from the header, probably
because until c1e6e61 it was invalid.

This patch fixes the splitter to use the now correct header data.

Regarding target/linux/ar71xx/files/drivers/mtd/tplinkpart.c,
this particular splitter "falls back" to the correct rootfs offset
reading and as such it doesn't need to be updated, although it will
report a kernel partition length that can be larger than the actual
length as it assumes that partition fills the entire segment up to
the rootfs partition.

Tested-by: Mathias Kresin <dev@kresin.me>
Tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Tested-by: Daniel Engberg <daniel.engberg.lists@pyret.net>
Tested-by: Henryk Heisig <hyniu@o2.pl>
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
This commit is contained in:
Thibaut VARÈNE 2017-10-28 14:48:08 +02:00 committed by Mathias Kresin
parent 050fb3b55c
commit 74f891752b
1 changed files with 6 additions and 6 deletions
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12
target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c
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@ -106,6 +106,7 @@ static int mtdsplit_parse_tplink(struct mtd_info *master,
return -EINVAL;
kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v1.kernel_len);
rootfs_offset = be32_to_cpu(hdr.v1.rootfs_ofs);
break;
case 2:
case 3:
@ -113,6 +114,7 @@ static int mtdsplit_parse_tplink(struct mtd_info *master,
return -EINVAL;
kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v2.kernel_len);
rootfs_offset = be32_to_cpu(hdr.v2.rootfs_ofs);
break;
default:
return -EINVAL;
@ -121,11 +123,9 @@ static int mtdsplit_parse_tplink(struct mtd_info *master,
if (kernel_size > master->size)
return -EINVAL;
/* Find the rootfs after the kernel. */
err = mtd_check_rootfs_magic(master, kernel_size, NULL);
if (!err) {
rootfs_offset = kernel_size;
} else {
/* Find the rootfs */
err = mtd_check_rootfs_magic(master, rootfs_offset, NULL);
if (err) {
/*
* The size in the header might cover the rootfs as well.
* Start the search from an arbitrary offset.
@ -142,7 +142,7 @@ static int mtdsplit_parse_tplink(struct mtd_info *master,
parts[0].name = KERNEL_PART_NAME;
parts[0].offset = 0;
parts[0].size = rootfs_offset;
parts[0].size = kernel_size;
parts[1].name = ROOTFS_PART_NAME;
parts[1].offset = rootfs_offset;