linux-ext4 - Re: [PATCH -next v2 2/3] ext4: fix potential memory leak in ext4_fc_record

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Date:   Wed, 21 Sep 2022 13:32:47 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin10@...wei.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz
Subject: Re: [PATCH -next v2 2/3] ext4: fix potential memory leak in
 ext4_fc_record_regions()

On Wed 21-09-22 14:40:39, Ye Bin wrote:
> As krealloc may return NULL, in this case 'state->fc_regions' may not be
> freed by krealloc, but 'state->fc_regions' already set NULL. Then will
> lead to 'state->fc_regions' memory leak.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/fast_commit.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
> index 29a22ee0adb8..f5b0fc50ed47 100644
> --- a/fs/ext4/fast_commit.c
> +++ b/fs/ext4/fast_commit.c
> @@ -1679,15 +1679,17 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,
>  	if (replay && state->fc_regions_used != state->fc_regions_valid)
>  		state->fc_regions_used = state->fc_regions_valid;
>  	if (state->fc_regions_used == state->fc_regions_size) {
> +		struct ext4_fc_alloc_region *fc_regions;
> +
>  		state->fc_regions_size +=
>  			EXT4_FC_REPLAY_REALLOC_INCREMENT;
> -		state->fc_regions = krealloc(
> -					state->fc_regions,
> -					state->fc_regions_size *
> -					sizeof(struct ext4_fc_alloc_region),
> -					GFP_KERNEL);
> -		if (!state->fc_regions)
> +		fc_regions = krealloc(state->fc_regions,
> +				      state->fc_regions_size *
> +				      sizeof(struct ext4_fc_alloc_region),
> +				      GFP_KERNEL);
> +		if (!fc_regions)
>  			return -ENOMEM;
> +		state->fc_regions = fc_regions;
>  	}
>  	region = &state->fc_regions[state->fc_regions_used++];
>  	region->ino = ino;
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR