linux-ext4 - [PATCH] ext4: correct error handling of ext4_get_journal

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Date:   Sat, 26 Aug 2023 09:10:29 +0800
From:   Zhang Yi <yi.zhang@...weicloud.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
        yi.zhang@...wei.com, yi.zhang@...weicloud.com,
        chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: [PATCH] ext4: correct error handling of ext4_get_journal_inode()

From: Zhang Yi <yi.zhang@...wei.com>

Commit '99d6c5d892bf ("ext4: ext4_get_{dev}_journal return proper error
value")' changed ext4_get_journal_inode() to return error return value
when something bad happened, but missed to modify the caller
ext4_calculate_overhead(), so fix it.

Reported-by: syzbot+b3123e6d9842e526de39@...kaller.appspotmail.com
Fixes: 99d6c5d892bf ("ext4: ext4_get_{dev}_journal return proper error value")
Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index bb42525de8d0..91f20afa1d71 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4260,7 +4260,7 @@ int ext4_calculate_overhead(struct super_block *sb)
 	else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
 		/* j_inum for internal journal is non-zero */
 		j_inode = ext4_get_journal_inode(sb, j_inum);
-		if (j_inode) {
+		if (!IS_ERR(j_inode)) {
 			j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
 			overhead += EXT4_NUM_B2C(sbi, j_blocks);
 			iput(j_inode);
-- 
2.39.2