linux-kernel - Re: [PATCH] mtd: jedec_probe: fix shift-out-of-bounds UB in JEDEC ID masking

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Message-Id: <176909093883.3112602.14114861213916444270.b4-ty@bootlin.com>
Date: Thu, 22 Jan 2026 15:08:58 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: linux-kernel@...r.kernel.org, Chenxi Hou <ch395@...t.edu>
Cc: colin.i.king@...il.com, linux-mtd@...ts.infradead.org, richard@....at, 
 rk0006818@...il.com, vigneshr@...com, Hui Peng <benquike@...il.com>, 
 "Zhihao (Zephyr) Yao" <zhihao.yao@...t.edu>
Subject: Re: [PATCH] mtd: jedec_probe: fix shift-out-of-bounds UB in JEDEC
 ID masking

On Wed, 21 Jan 2026 20:32:50 -0500, Chenxi Hou wrote:
> UBSAN reports shift-out-of-bounds in jedec_read_mfr() and jedec_read_id():
> 
>   UBSAN: shift-out-of-bounds in drivers/mtd/chips/jedec_probe.c:1924:13
>   shift exponent 32 is too large for 32-bit type 'int'
>   UBSAN: shift-out-of-bounds in drivers/mtd/chips/jedec_probe.c:1940:12
>   shift exponent 32 is too large for 32-bit type 'int'
> 
> [...]

Applied to mtd/next, thanks!

[1/1] mtd: jedec_probe: fix shift-out-of-bounds UB in JEDEC ID masking
      commit: 2b14660c1caf0b67adf99428a225f71ed653437d

Patche(s) should be available on mtd/linux.git and will be
part of the next PR (provided that no robot complains by then).

Kind regards,
Miquèl