3.16.7-ckt19 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Richard Weinberger <richard@xxxxxx>
commit 281fda27673f833a01d516658a64d22a32c8e072 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@xxxxxx>
Reviewed-by: David Gstir <david@xxxxxxxxxxxxx>
[ luis: backported to 3.16:
- no ubi_device parameter for the ubi_err() macro in 3.16 ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/mtd/ubi/io.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index d36134925d31..db657f2168d7 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -921,6 +921,11 @@ 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
--
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