[PATCH 5/8] cifs: Fix buffer overflow when parsing NFS reparse points

["Pali Rohár" <pali@kernel.org>]

ReparseDataLength is sum of the InodeType size and DataBuffer size.
So to get DataBuffer size it is needed to subtract InodeType's size from
ReparseDataLength.

Function cifs_strndup_from_utf16() is currentlly accessing buf->DataBuffer
at position after the end of the buffer because it does not subtract
InodeType size from the length. Fix this problem and correctly subtract
variable len.

Member InodeType is present only when reparse buffer is large enough. Check
for ReparseDataLength before accessing InodeType to prevent another invalid
memory access.

Major and minor rdev values are present also only when reparse buffer is
large enough. Check for reparse buffer size in reparse_nfs_mkdev().

Fixes: d5ecebc4900d ("smb3: Allow query of symlinks stored as reparse points")
Signed-off-by: Pali Rohár <pali@kernel.org>
---
 fs/smb/client/reparse.c | 11 ++++++++++-
 fs/smb/client/reparse.h |  3 +++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c
index 63984796721a..af32a7dbca4b 100644
--- a/fs/smb/client/reparse.c
+++ b/fs/smb/client/reparse.c
@@ -320,9 +320,16 @@ static int parse_reparse_posix(struct reparse_posix_data *buf,
 	unsigned int len;
 	u64 type;
 
+	len = le16_to_cpu(buf->ReparseDataLength);
+	if (len < sizeof(buf->InodeType)) {
+		cifs_dbg(VFS, "srv returned malformed nfs buffer\n");
+		return -EIO;
+	}
+
+	len -= sizeof(buf->InodeType);
+
 	switch ((type = le64_to_cpu(buf->InodeType))) {
 	case NFS_SPECFILE_LNK:
-		len = le16_to_cpu(buf->ReparseDataLength);
 		data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer,
 							       len, true,
 							       cifs_sb->local_nls);
@@ -482,6 +489,8 @@ bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
 	u32 tag = data->reparse.tag;
 
 	if (tag == IO_REPARSE_TAG_NFS && buf) {
+		if (le16_to_cpu(buf->ReparseDataLength) < sizeof(buf->InodeType))
+			return false;
 		switch (le64_to_cpu(buf->InodeType)) {
 		case NFS_SPECFILE_CHR:
 			fattr->cf_mode |= S_IFCHR;
diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h
index 790360f8a53b..5be54878265e 100644
--- a/fs/smb/client/reparse.h
+++ b/fs/smb/client/reparse.h
@@ -22,6 +22,9 @@ static inline dev_t reparse_nfs_mkdev(struct reparse_posix_data *buf)
 {
 	u32 major, minor;
 
+	if (le16_to_cpu(buf->ReparseDataLength) != sizeof(buf->InodeType) + 2*sizeof(__le32))
+		return 0;
+
 	major = le32_to_cpu(((__le32 *)buf->DataBuffer)[0]);
 	minor = le32_to_cpu(((__le32 *)buf->DataBuffer)[1]);
 
-- 
2.20.1