linux-ext4 - e2fsprogs coverity patch <cid-13.diff>

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Message-Id: <200702100211.l1A2BBla007031@igsi.llnl.gov>
Date:	Fri, 9 Feb 2007 18:11:11 -0800
From:	"Brian D. Behlendorf" <behlendorf1@...l.gov>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, adilger@...sterfs.com,
	behlendorf1@...l.gov, wartens2@...l.gov
Subject: e2fsprogs coverity patch <cid-13.diff>

Lawrence Livermore National Labs recently ran the source code
analysis tool Coverity over the e2fsprogs-1.39 source to see 
if it would identify any significant bugs.  The analysis
turned up 38 mostly minor issues which are enumerated here
with patches.  We went through and resolved these issues
but would love to see these mostly minor changes reviewed
and commited upstream.

Thanks,
Brian Behlendorf <behlendorf1@...l.gov>, and
Herb Wartens <wartens2@...l.gov>

-----------------------------------------------------------------------------
Coverity ID: 13: Overrun Static

Add an extra byte to EXT2_NAME_LEN in the static allocation for the
required trailing NULL.  This allows filenames up to the maximum 
length of EXT2_NAME_LEN withover an overrun.

Index: e2fsprogs+chaos/debugfs/htree.c
===================================================================
--- e2fsprogs+chaos.orig/debugfs/htree.c
+++ e2fsprogs+chaos/debugfs/htree.c
@@ -35,7 +35,7 @@ static void htree_dump_leaf_node(ext2_fi
 	struct ext2_dir_entry *dirent;
 	int		thislen, col = 0;
 	unsigned int	offset = 0;
-	char		name[EXT2_NAME_LEN];
+	char		name[EXT2_NAME_LEN + 1];
 	char		tmp[EXT2_NAME_LEN + 16];
 	blk_t		pblk;
 	ext2_dirhash_t 	hash;
@@ -63,7 +63,7 @@ static void htree_dump_leaf_node(ext2_fi
 			fprintf(pager, "Corrupted directory block (%u)!\n", blk);
 			break;
 		}
-		thislen = ((dirent->name_len & 0xFF) < EXT2_NAME_LEN) ?
+		thislen = ((dirent->name_len & 0xFF) <= EXT2_NAME_LEN) ?
 			(dirent->name_len & 0xFF) : EXT2_NAME_LEN;
 		strncpy(name, dirent->name, thislen);
 		name[thislen] = '\0';
-
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