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Date: Wed, 4 May 2022 18:44:12 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Oleksandr Ocheretnyi <oocheret@...co.com>, Miquel Raynal <miquel.raynal@...tlin.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.10 060/129] mtd: fix part field data corruption in mtd_info From: Oleksandr Ocheretnyi <oocheret@...co.com> [ Upstream commit 37c5f9e80e015d0df17d0c377c18523002986851 ] Commit 46b5889cc2c5 ("mtd: implement proper partition handling") started using "mtd_get_master_ofs()" in mtd callbacks to determine memory offsets by means of 'part' field from mtd_info, what previously was smashed accessing 'master' field in the mtd_set_dev_defaults() method. That provides wrong offset what causes hardware access errors. Just make 'part', 'master' as separate fields, rather than using union type to avoid 'part' data corruption when mtd_set_dev_defaults() is called. Fixes: 46b5889cc2c5 ("mtd: implement proper partition handling") Signed-off-by: Oleksandr Ocheretnyi <oocheret@...co.com> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com> Link: https://lore.kernel.org/linux-mtd/20220417184649.449289-1-oocheret@cisco.com Signed-off-by: Sasha Levin <sashal@...nel.org> --- include/linux/mtd/mtd.h | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 157357ec1441..fc41fecfe44f 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -388,10 +388,8 @@ struct mtd_info { /* List of partitions attached to this MTD device */ struct list_head partitions; - union { - struct mtd_part part; - struct mtd_master master; - }; + struct mtd_part part; + struct mtd_master master; }; static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd) -- 2.35.1
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