mmc: block: reject invalid perdev_minors before division

The mmcblk.perdev_minors module parameter is parsed as a signed int and
is used during mmc_blk_init() to compute the number of supported block
devices.

Passing perdev_minors=0 makes the init path divide by zero when it
computes max_devices. Negative values are invalid as well and would make
max_devices negative before it is later used as an IDA limit.

Reject non-positive perdev_minors values before registering any mmcblk
resources.

Signed-off-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

0 files changed, 0 insertions, 0 deletions