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| author | Oldřich Jedlička <oldium.pro@gmail.com> | 2019-09-25 21:45:42 +0200 |
|---|---|---|
| committer | Petr Štetiar <ynezz@true.cz> | 2019-10-09 14:45:25 +0200 |
| commit | e0ce80d42ace6feba509da16795ab0eb81cf5bf4 (patch) | |
| tree | 480373e870852be3f9af5e743005ed39d972fa96 | |
| parent | 4ed356fa719e8923c231524181e15ab67eb37bac (diff) | |
| download | openwrt-e0ce80d42ace6feba509da16795ab0eb81cf5bf4.tar.gz openwrt-e0ce80d42ace6feba509da16795ab0eb81cf5bf4.tar.bz2 openwrt-e0ce80d42ace6feba509da16795ab0eb81cf5bf4.zip | |
kernel: Fix off-by-one error in FIT mtd partition search.
This fixes off-by-one error introduced in commit dc76900021b8
("kernel: Correctly search for the FIT image in mtd partition.")
Function `mtd_read` starts reading at `offset` and
needs `hdr_len` number of bytes to be available. Suppose
the easiest case when `offset` is `0` and `hdr_len` equals
to `mtd->size` - the `for` loop will not be entered even
when enough bytes are available to be read.
Same happens for any non-zero `offset`, when `hdr_len` is
just enough bytes to be read until `mtd->size` is reached.
Imagine that for example `mtd->size=5`, `offset=4` and
`hdr_len=1`. Then `offset+hdr_len=5` and the check has to
be `offset+hdr_len <= mtd->size`, i.e. `5 <= 5`. The
check for `offset + hdr_len` value needs to be inclusive,
therefore use `<=`.
Fixes: dc76900021b8 ("kernel: Correctly search for the FIT image in mtd partition.")
Signed-off-by: Oldřich Jedlička <oldium.pro@gmail.com>
[adjusted commit ref, fixes tag]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
| -rw-r--r-- | target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c index d206fecd5b..67ee33d085 100644 --- a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c +++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c @@ -60,7 +60,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd, hdr_len = sizeof(struct fdt_header); /* Parse the MTD device & search for the FIT image location */ - for(offset = 0; offset + hdr_len < mtd->size; offset += mtd->erasesize) { + for(offset = 0; offset + hdr_len <= mtd->size; offset += mtd->erasesize) { ret = mtd_read(mtd, offset, hdr_len, &retlen, (void*) &hdr); if (ret) { pr_err("read error in \"%s\" at offset 0x%llx\n", |