linux-kernel - [PATCH 5.10 070/390] ext4: update state->fc_regions

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Date:   Mon, 24 Oct 2022 13:27:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, stable@...nel.org,
        Ye Bin <yebin10@...wei.com>, Jan Kara <jack@...e.cz>,
        Theodore Tso <tytso@....edu>
Subject: [PATCH 5.10 070/390] ext4: update state->fc_regions_size after successful memory allocation

From: Ye Bin <yebin10@...wei.com>

commit 27cd49780381c6ccbf248798e5e8fd076200ffba upstream.

To avoid to 'state->fc_regions_size' mismatch with 'state->fc_regions'
when fail to reallocate 'fc_reqions',only update 'state->fc_regions_size'
after 'state->fc_regions' is allocated successfully.

Cc: stable@...nel.org
Signed-off-by: Ye Bin <yebin10@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Link: https://lore.kernel.org/r/20220921064040.3693255-4-yebin10@huawei.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ext4/fast_commit.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -1586,14 +1586,15 @@ int ext4_fc_record_regions(struct super_
 	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;
 		fc_regions = krealloc(state->fc_regions,
-				      state->fc_regions_size *
-				      sizeof(struct ext4_fc_alloc_region),
+				      sizeof(struct ext4_fc_alloc_region) *
+				      (state->fc_regions_size +
+				       EXT4_FC_REPLAY_REALLOC_INCREMENT),
 				      GFP_KERNEL);
 		if (!fc_regions)
 			return -ENOMEM;
+		state->fc_regions_size +=
+			EXT4_FC_REPLAY_REALLOC_INCREMENT;
 		state->fc_regions = fc_regions;
 	}
 	region = &state->fc_regions[state->fc_regions_used++];