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linux/fs/exfat/balloc.c
Namjae Jeon 88fc3dd6e6 exfat: fix divide-by-zero in exfat_allocate_bitmap 
[ Upstream commit d70a5804c5 ]

The variable max_ra_count can be 0 in exfat_allocate_bitmap(),
which causes a divide-by-zero error in the subsequent modulo operation
(i % max_ra_count), leading to a system crash.
When max_ra_count is 0, it means that readahead is not used. This patch
load the bitmap without readahead.

Fixes: 9fd688678d ("exfat: optimize allocation bitmap loading time")
Reported-by: Jiaming Zhang <r772577952@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-12-18 14:03:31 +01:00

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