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erofs: fix incorrect early exits in volume label handling

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Crafted EROFS images containing valid volume labels can trigger
incorrect early returns, leading to folio reference leaks.

However, this does not cause system crashes or other severe issues.

Fixes: 1cf12c7177 ("erofs: Add support for FS_IOC_GETFSLABEL")
Cc: stable@kernel.org
Reviewed-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2025-12-29 17:29:47 +08:00
parent 643575d5a4
commit 3afa4da388
1 changed files with 4 additions and 2 deletions
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6
fs/erofs/super.c
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@ -347,8 +347,10 @@ static int erofs_read_superblock(struct super_block *sb)
if (dsb->volume_name[0]) {
sbi->volume_name = kstrndup(dsb->volume_name,
sizeof(dsb->volume_name), GFP_KERNEL);
if (!sbi->volume_name)
return -ENOMEM;
if (!sbi->volume_name) {
ret = -ENOMEM;
goto out;
}
}
/* parse on-disk compression configurations */