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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>
This commit is contained in:
Chengguang Xu 2018-08-30 21:33:31 +08:00 committed by Jaegeuk Kim
parent b36fdc6853
commit 1618e6e297
1 changed files with 3 additions and 0 deletions
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3
fs/f2fs/acl.c
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@ -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);