This is a note to let you know that I've just added the patch titled
UBI: Validate data_size
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ubi-validate-data_size.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 281fda27673f833a01d516658a64d22a32c8e072 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@xxxxxx>
Date: Tue, 22 Sep 2015 23:58:07 +0200
Subject: UBI: Validate data_size
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/ubi/io.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -926,6 +926,11 @@ static int validate_vid_hdr(const struct
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
Patches currently in stable-queue which might be from richard@xxxxxx are
queue-4.2/ubifs-kill-unneeded-locking-in-ubifs_init_security.patch
queue-4.2/ubi-validate-data_size.patch
queue-4.2/ubi-return-enospc-if-no-enough-space-available.patch
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