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ext4: set type of ac_groups_linear_remaining to __u32 to avoid overflow
commit9a9f3a9842
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:196e402adf
("ext4: improve cr 0 / cr 1 group scanning") CC: stable@kernel.org Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20240319113325.3110393-8-libaokun1@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -194,8 +194,8 @@ struct ext4_allocation_context {
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__u32 ac_groups_considered;
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__u32 ac_flags; /* allocation hints */
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__u32 ac_groups_linear_remaining;
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__u16 ac_groups_scanned;
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__u16 ac_groups_linear_remaining;
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__u16 ac_found;
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__u16 ac_cX_found[EXT4_MB_NUM_CRS];
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__u16 ac_tail;
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