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mtd: Make sure mtd->erasesize is valid even if the partition is of size 0

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commit ad46351530 upstream.

Commit 33f45c44d6 ("mtd: Do not allow MTD devices with inconsistent
erase properties") introduced a check to make sure ->erasesize and
->_erase values are consistent with the MTD_NO_ERASE flag.
This patch did not take the 0 bytes partition case into account which
can happen when the defined partition is outside the flash device memory
range. Fix that by setting the partition erasesize to the parent
erasesize.

Fixes: 33f45c44d6 ("mtd: Do not allow MTD devices with inconsistent erase properties")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: <stable@vger.kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Boris Brezillon
2019-01-30 12:55:52 +01:00
committed by Greg Kroah-Hartman
parent 43d3d51415
commit 3ca59bf1fb
1 changed files with 4 additions and 0 deletions
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4
drivers/mtd/mtdpart.c
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@@ -470,6 +470,10 @@ static struct mtd_part *allocate_partition(struct mtd_info *parent,
/* let's register it anyway to preserve ordering */
slave->offset = 0;
slave->mtd.size = 0;
/* Initialize ->erasesize to make add_mtd_device() happy. */
slave->mtd.erasesize = parent->erasesize;
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
part->name);
goto out_register;