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ext4: set type of ac_groups_linear_remaining to __u32 to avoid overflow 

commit 9a9f3a9842 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>
This commit is contained in:
Baokun Li 2024-03-19 19:33:23 +08:00 committed by Greg Kroah-Hartman
parent 3093e586b0
commit b0b47084f5
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/mballoc.h
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@ -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;