This is a note to let you know that I've just added the patch titled
mtd: physmap: physmap-bt1-rom: Fix unintentional stack access
to the 5.12-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:
mtd-physmap-physmap-bt1-rom-fix-unintentional-stack-access.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 683313993dbe1651c7aa00bb42a041d70e914925 Mon Sep 17 00:00:00 2001
From: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>
Date: Fri, 12 Feb 2021 04:40:22 -0600
Subject: mtd: physmap: physmap-bt1-rom: Fix unintentional stack access
From: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
commit 683313993dbe1651c7aa00bb42a041d70e914925 upstream.
Cast &data to (char *) in order to avoid unintentionally accessing
the stack.
Notice that data is of type u32, so any increment to &data
will be in the order of 4-byte chunks, and this piece of code
is actually intended to be a byte offset.
Fixes: b3e79e7682e0 ("mtd: physmap: Add Baikal-T1 physically mapped ROM support")
Addresses-Coverity-ID: 1497765 ("Out-of-bounds access")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20210212104022.GA242669@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/maps/physmap-bt1-rom.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mtd/maps/physmap-bt1-rom.c
+++ b/drivers/mtd/maps/physmap-bt1-rom.c
@@ -79,7 +79,7 @@ static void __xipram bt1_rom_map_copy_fr
if (shift) {
chunk = min_t(ssize_t, 4 - shift, len);
data = readl_relaxed(src - shift);
- memcpy(to, &data + shift, chunk);
+ memcpy(to, (char *)&data + shift, chunk);
src += chunk;
to += chunk;
len -= chunk;
Patches currently in stable-queue which might be from gustavoars@xxxxxxxxxx are
queue-5.12/mtd-physmap-physmap-bt1-rom-fix-unintentional-stack-access.patch
