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mtd: Do not allow MTD devices with inconsistent erase properties 

When mtd->erasesize is 0 or mtd->_erase is NULL, that means the device
does not support the erase operation, which in turn means it should
have the MTD_NO_ERASE flag set.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Miquel Raynal <miquel.raynal@free-electrons.com>
This commit is contained in:
Boris Brezillon 2017-12-15 13:39:51 +01:00
parent 911c3a30ca
commit 33f45c44d6
1 changed files with 5 additions and 0 deletions
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5
drivers/mtd/mtdcore.c
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@ -503,6 +503,11 @@ int add_mtd_device(struct mtd_info *mtd)
return -EEXIST; return -EEXIST;
BUG_ON(mtd->writesize == 0); BUG_ON(mtd->writesize == 0);
if (WARN_ON((!mtd->erasesize || !mtd->_erase) &&
!(mtd->flags & MTD_NO_ERASE)))
return -EINVAL;
mutex_lock(&mtd_table_mutex); mutex_lock(&mtd_table_mutex);
i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL); i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL);