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ubi: Refuse attaching if mtd's erasesize is 0
author
Zhihao Cheng
<chengzhihao1@huawei.com>
Sun, 23 Apr 2023 11:10:41 +0000
(19:10 +0800)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Tue, 10 Oct 2023 20:00:39 +0000
(22:00 +0200)
[ Upstream commit
017c73a34a661a861712f7cc1393a123e5b2208c
]
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:
801c135ce73d
("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>
drivers/mtd/ubi/build.c
patch
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history
diff --git
a/drivers/mtd/ubi/build.c
b/drivers/mtd/ubi/build.c
index
1662c12
..
6fbd77d
100644
(file)
--- a/
drivers/mtd/ubi/build.c
+++ b/
drivers/mtd/ubi/build.c
@@
-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++)