[PATCH v2] mtd: phram: Prevent divide by zero bug in phram_setup()

[Miquel Raynal]

On Fri, 2022-01-21 at 11:55:05 UTC, Dan Carpenter wrote:
> The problem is that "erasesize" is a uint64_t type so it might be
> non-zero but the lower 32 bits are zero so when it's truncated,
> "(uint32_t)erasesize", then that value is zero. This leads to a
> divide by zero bug.
> 
> Avoid the bug by delaying the divide until after we have validated
> that "erasesize" is non-zero and within the uint32_t range.
> 
> Fixes: dc2b3e5cbc80 ("mtd: phram: use div_u64_rem to stop overwrite len in phram_setup")
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel