mmc: block: reject invalid perdev_minors before division

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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>

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Xu Rao 2026-07-06 17:25:00 +08:00 • committed by Ulf Hansson

parent df92d47b3a

commit 5253aee00a

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drivers/mmc/core/block.c

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