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md: avoid signed overflow in slot_store()

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[ Upstream commit 3bc5729227 ]

slot_store() uses kstrtouint() to get a slot number, but stores the
result in an "int" variable (by casting a pointer).
This can result in a negative slot number if the unsigned int value is
very large.

A negative number means that the slot is empty, but setting a negative
slot number this way will not remove the device from the array.  I don't
think this is a serious problem, but it could cause confusion and it is
best to fix it.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
NeilBrown 2023-03-06 09:36:25 +11:00 committed by Greg Kroah-Hartman
parent 643170dac6
commit b7de906cf9
1 changed files with 3 additions and 0 deletions
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3
drivers/md/md.c
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@ -2991,6 +2991,9 @@ slot_store(struct md_rdev *rdev, const char *buf, size_t len)
err = kstrtouint(buf, 10, (unsigned int *)&slot);
if (err < 0)
return err;
if (slot < 0)
/* overflow */
return -ENOSPC;
}
if (rdev->mddev->pers && slot == -1) {
/* Setting 'slot' on an active array requires also