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