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ext4: fix potential memory leak in ext4_fc_record_modified_inode() 

commit 9305721a30 upstream.

As krealloc may return NULL, in this case 'state->fc_modified_inodes'
may not be freed by krealloc, but 'state->fc_modified_inodes' already
set NULL. Then will lead to 'state->fc_modified_inodes' memory leak.

Cc: stable@kernel.org
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220921064040.3693255-2-yebin10@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:
Ye Bin 2022-09-21 14:40:38 +08:00 committed by Greg Kroah-Hartman
parent a4a8c7e51e
commit c0be17635f
1 changed files with 5 additions and 3 deletions
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8
fs/ext4/fast_commit.c
View File

@ -1494,13 +1494,15 @@ static int ext4_fc_record_modified_inode(struct super_block *sb, int ino)
if (state->fc_modified_inodes[i] == ino)
return 0;
if (state->fc_modified_inodes_used == state->fc_modified_inodes_size) {
state->fc_modified_inodes = krealloc(
state->fc_modified_inodes,
int *fc_modified_inodes;
fc_modified_inodes = krealloc(state->fc_modified_inodes,
sizeof(int) * (state->fc_modified_inodes_size +
EXT4_FC_REPLAY_REALLOC_INCREMENT),
GFP_KERNEL);
if (!state->fc_modified_inodes)
if (!fc_modified_inodes)
return -ENOMEM;
state->fc_modified_inodes = fc_modified_inodes;
state->fc_modified_inodes_size +=
EXT4_FC_REPLAY_REALLOC_INCREMENT;
}