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authorRichard Weinberger <richard@nod.at>2015-09-23 00:58:07 +0300
committerRichard Weinberger <richard@nod.at>2015-09-29 13:47:04 +0300
commit281fda27673f833a01d516658a64d22a32c8e072 (patch)
treeb00db9a22f925bc2156238f0065b0b4525b2ef5e /drivers/mtd/ubi/io.c
parentcf6f54e3f133229f02a90c04fe0ff9dd9d3264b4 (diff)
downloadlinux-281fda27673f833a01d516658a64d22a32c8e072.tar.xz
UBI: Validate data_size
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(). Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: David Gstir <david@sigma-star.at>
Diffstat (limited to 'drivers/mtd/ubi/io.c')
-rw-r--r--drivers/mtd/ubi/io.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 5bbd1f094f4e..1fc23e48fe8e 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -926,6 +926,11 @@ static int validate_vid_hdr(const struct ubi_device *ubi,
goto bad;
}
+ if (data_size > ubi->leb_size) {
+ ubi_err(ubi, "bad data_size");
+ goto bad;
+ }
+
if (vol_type == UBI_VID_STATIC) {
/*
* Although from high-level point of view static volumes may