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ext4: fix lost error code reporting in __ext4_fill_super() 

When code was factored out of __ext4_fill_super() into
ext4_percpu_param_init() the error return was discarded.  This meant
that it was possible for __ext4_fill_super() to return zero,
indicating success, without the struct super getting completely filled
in, leading to a potential NULL pointer dereference.

Reported-by: syzbot+bbf0f9a213c94f283a5c@syzkaller.appspotmail.com
Fixes: 1f79467c8a ("ext4: factor out ext4_percpu_param_init() ...")
Link: https://syzkaller.appspot.com/bug?id=6dac47d5e58af770c0055f680369586ec32e144c
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
This commit is contained in:
Theodore Ts'o 2023-04-27 19:18:01 -04:00
parent 856dd6c598
commit d5e72c4e32
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/super.c
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@ -5502,7 +5502,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sbi->s_journal->j_commit_callback =
ext4_journal_commit_callback;
if (ext4_percpu_param_init(sbi))
err = ext4_percpu_param_init(sbi);
if (err)
goto failed_mount6;
if (ext4_has_feature_flex_bg(sb))