4.19-stable review patch. If anyone has any objections, please let me know.
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From: Tetsuo Handa penguin-kernel@i-love.sakura.ne.jp
commit 37ae5a0f5287a52cf51242e76ccf198d02ffe495 upstream.
Since lo_simple_ioctl(LOOP_SET_BLOCK_SIZE) and ioctl(NBD_SET_BLKSIZE) pass user-controlled "unsigned long arg" to blk_validate_block_size(), "unsigned long" should be used for validation.
Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/9ecbf057-4375-c2db-ab53-e4cc0dff953d@i-love.sakura... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: David Hunter david.hunter.linux@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/blkdev.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -56,7 +56,7 @@ struct blk_stat_callback; */ #define BLKCG_MAX_POLS 5
-static inline int blk_validate_block_size(unsigned int bsize) +static inline int blk_validate_block_size(unsigned long bsize) { if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) return -EINVAL;