Re: [PATCH] f2fs: fix listxattr handling of corrupted xattr entries

[Chao Yu]

On 6/19/26 04:01, Keshav Verma wrote:
> Validate the xattr entry before reading its fields in f2fs_listxattr().
> Return -EFSCORRUPTED when the entry is outside the valid xattr storage
> area instead of returning a successful partial result.

Fixes line and Cc: stable@xxxxxxxxxx

> Signed-off-by: Keshav Verma <iganschel@xxxxxxxxx>

Reviewed-by: Chao Yu <chao@xxxxxxxxxx>

Thanks,

> ---
>   fs/f2fs/xattr.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
> index 610d5810074d..18f495db20d2 100644
> --- a/fs/f2fs/xattr.c
> +++ b/fs/f2fs/xattr.c
> @@ -581,8 +581,6 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
>   		size_t prefix_len;
>   		size_t size;
>   
> -		prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);
> -
>   		if ((void *)(entry) + sizeof(__u32) > last_base_addr ||
>   			(void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {
>   			f2fs_err(F2FS_I_SB(inode), "list inode (%llu) has corrupted xattr",
> @@ -590,9 +588,12 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
>   			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
>   			f2fs_handle_error(F2FS_I_SB(inode),
>   						ERROR_CORRUPTED_XATTR);
> -			break;
> +			error = -EFSCORRUPTED;
> +			goto cleanup;
>   		}
>   
> +		prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);
> +
>   		if (!prefix)
>   			continue;
>