Hi Chengguang,
On 2018/8/30 21:33, Chengguang Xu wrote:
> Add additinal sanity check for irregular case(e.g. corruption).
> If size of extended attribution is smaller than size of acl header,
> then return -EINVAL.
>
> Signed-off-by: Chengguang Xu <[email protected]>
> ---
> fs/f2fs/acl.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
> index 111824199a88..79e9ea773070 100644
> --- a/fs/f2fs/acl.c
> +++ b/fs/f2fs/acl.c
> @@ -53,6 +53,9 @@ static struct posix_acl *f2fs_acl_from_disk(const char
> *value, size_t size)
> struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
> const char *end = value + size;
>
> + if (size < sizeof(f2fs_acl_header))
> + return ERR_PTR(-EINVAL);
I guess below codes have checked that already?
count = f2fs_acl_count(size);
if (count < 0)
return ERR_PTR(-EINVAL);
Thanks,
> +
> if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
> return ERR_PTR(-EINVAL);
>
>
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