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ubi: Refuse attaching if mtd's erasesize is 0 

[ Upstream commit 017c73a34a ]

There exists mtd devices with zero erasesize, which will trigger a
divide-by-zero exception while attaching ubi device.
Fix it by refusing attaching if mtd's erasesize is 0.

Fixes: 801c135ce7 ("UBI: Unsorted Block Images")
Reported-by: Yu Hao <yhao016@ucr.edu>
Link: https://lore.kernel.org/lkml/977347543.226888.1682011999468.JavaMail.zimbra@nod.at/T/
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhihao Cheng 2023-04-23 19:10:41 +08:00 committed by Greg Kroah-Hartman
parent f237b17611
commit 91aeb418b9
1 changed files with 7 additions and 0 deletions
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7
drivers/mtd/ubi/build.c
View File

@ -893,6 +893,13 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
return -EINVAL;
}
/* UBI cannot work on flashes with zero erasesize. */
if (!mtd->erasesize) {
pr_err("ubi: refuse attaching mtd%d - zero erasesize flash is not supported\n",
mtd->index);
return -EINVAL;
}
if (ubi_num == UBI_DEV_NUM_AUTO) {
/* Search for an empty slot in the @ubi_devices array */
for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)