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UBI: Validate data_size

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commit 281fda2767 upstream.

Make sure that data_size is less than LEB size.
Otherwise a handcrafted UBI image is able to trigger
an out of bounds memory access in ubi_compare_lebs().

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: David Gstir <david@sigma-star.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Richard Weinberger
2015-09-22 23:58:07 +02:00
committed by Greg Kroah-Hartman
parent 892e053cd7
commit a5bae33a35
1 changed files with 5 additions and 0 deletions
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5
drivers/mtd/ubi/io.c
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@@ -931,6 +931,11 @@ static int validate_vid_hdr(const struct ubi_device *ubi,
goto bad;
}
if (data_size > ubi->leb_size) {
ubi_err("bad data_size");
goto bad;
}
if (vol_type == UBI_VID_STATIC) {
/*
* Although from high-level point of view static volumes may