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ubi: Fix error for write access 

When opening a device with write access, ubiblock_open returns an error
code. Currently, this error code is -EPERM, but this is not the right
value.

The open function for other block devices returns -EROFS when opening
read-only devices with FMODE_WRITE set. When used with dm-verity, the
veritysetup userspace tool is expecting EROFS, and refuses to use the
ubiblock device.

Use -EROFS for ubiblock as well. As a result, veritysetup accepts the
ubiblock device as valid.

Cc: stable@vger.kernel.org
Fixes: 9d54c8a33e (UBI: R/O block driver on top of UBI volumes)
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Romain Izard 2018-01-29 11:18:20 +01:00 committed by Richard Weinberger
parent 29b7a6fa1e
commit 78a8dfbabb
1 changed files with 1 additions and 1 deletions
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2
drivers/mtd/ubi/block.c
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@ -244,7 +244,7 @@ static int ubiblock_open(struct block_device *bdev, fmode_t mode)
* in any case.
*/
if (mode & FMODE_WRITE) {
ret = -EPERM;
ret = -EROFS;
goto out_unlock;
}