Commit 6b0136a2 authored Aug 30, 2018 by Chengguang Xu Committed by Jaegeuk Kim Oct 26, 2018

f2fs: add additional sanity check in f2fs_acl_from_disk()



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 <cgxu519@gmx.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent b2d1e92c

fs/f2fs/acl.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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(struct f2fs_acl_header))
		return ERR_PTR(-EINVAL);

		if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
		return ERR_PTR(-EINVAL);