From b0b47084f5d369e61d0750f1d7445e1e821ef482 Mon Sep 17 00:00:00 2001 From: Baokun Li Date: Tue, 19 Mar 2024 19:33:23 +0800 Subject: [PATCH] ext4: set type of ac_groups_linear_remaining to __u32 to avoid overflow commit 9a9f3a9842927e4af7ca10c19c94dad83bebd713 upstream. Now ac_groups_linear_remaining is of type __u16 and s_mb_max_linear_groups is of type unsigned int, so an overflow occurs when setting a value above 65535 through the mb_max_linear_groups sysfs interface. Therefore, the type of ac_groups_linear_remaining is set to __u32 to avoid overflow. Fixes: 196e402adf2e ("ext4: improve cr 0 / cr 1 group scanning") CC: stable@kernel.org Signed-off-by: Baokun Li Reviewed-by: Zhang Yi Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/20240319113325.3110393-8-libaokun1@huawei.com Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- fs/ext4/mballoc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h index d7aeb5da7d86..498af2abc5d8 100644 --- a/fs/ext4/mballoc.h +++ b/fs/ext4/mballoc.h @@ -194,8 +194,8 @@ struct ext4_allocation_context { __u32 ac_groups_considered; __u32 ac_flags; /* allocation hints */ + __u32 ac_groups_linear_remaining; __u16 ac_groups_scanned; - __u16 ac_groups_linear_remaining; __u16 ac_found; __u16 ac_cX_found[EXT4_MB_NUM_CRS]; __u16 ac_tail;