From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 16 Sep 2020 20:18:21 +0000 (+0300)
Subject: cifs: remove bogus debug code
X-Git-Tag: v5.15~2590^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d367cb960ce88914898cbfa43645c2e43ede9465;p=platform%2Fkernel%2Flinux-starfive.git

cifs: remove bogus debug code

The "end" pointer is either NULL or it points to the next byte to parse.
If there isn't a next byte then dereferencing "end" is an off-by-one out
of bounds error.  And, of course, if it's NULL that leads to an Oops.
Printing "*end" doesn't seem very useful so let's delete this code.

Also for the last debug statement, I noticed that it should be printing
"sequence_end" instead of "end" so fix that as well.

Reported-by: Dominik Maier <dmaier@sect.tu-berlin.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c
index 689162e..3150c19 100644
--- a/fs/cifs/asn1.c
+++ b/fs/cifs/asn1.c
@@ -530,8 +530,8 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 		return 0;
 	} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
 		   || (tag != ASN1_EOC)) {
-		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 0\n",
-			 cls, con, tag, end, *end);
+		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p exit 0\n",
+			 cls, con, tag, end);
 		return 0;
 	}
 
@@ -541,8 +541,8 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 		return 0;
 	} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
 		   || (tag != ASN1_SEQ)) {
-		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 1\n",
-			 cls, con, tag, end, *end);
+		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p exit 1\n",
+			 cls, con, tag, end);
 		return 0;
 	}
 
@@ -552,8 +552,8 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 		return 0;
 	} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
 		   || (tag != ASN1_EOC)) {
-		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 0\n",
-			 cls, con, tag, end, *end);
+		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p exit 0\n",
+			 cls, con, tag, end);
 		return 0;
 	}
 
@@ -564,8 +564,8 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 		return 0;
 	} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
 		   || (tag != ASN1_SEQ)) {
-		cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 1\n",
-			 cls, con, tag, end, *end);
+		cifs_dbg(FYI, "cls = %d con = %d tag = %d sequence_end = %p exit 1\n",
+			 cls, con, tag, sequence_end);
 		return 0;
 	}