linux-ext4 - [PATCH] libext2fs : Fix the return values for ino=0 in ext2fs_read_inode

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Date:	Sat, 12 Jul 2008 19:27:41 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	linux-ext4@...r.kernel.org, "Theodore Tso" <tytso@....edu>
Cc:	mkatiyar@...il.com
Subject: [PATCH] libext2fs : Fix the return values for ino=0 in ext2fs_read_inode_full() if inode cache has been flushed.

Hi Ted,

It looks like the right place to check for ino=0 in
ext2fs_read_inode_full() is before creating the inode cache, otherwise
since we set icache[i].ino = 0 in create_icache(), it will match the
loop below and thus we return a wrong value. Below patch fixes it.

==========================================================================

Signed-off-by: "Manish Katiyar" <mkatiyar@...il.com>

---
 lib/ext2fs/inode.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c
index 8908423..a08cb40 100644
--- a/lib/ext2fs/inode.c
+++ b/lib/ext2fs/inode.c
@@ -536,6 +536,8 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs,
ext2_ino_t ino,
 		if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
 			return retval;
 	}
+	if ((ino == 0) || (ino > fs->super->s_inodes_count))
+		return EXT2_ET_BAD_INODE_NUM;
 	/* Create inode cache if not present */
 	if (!fs->icache) {
 		retval = create_icache(fs);
@@ -552,8 +554,6 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs,
ext2_ino_t ino,
 			}
 		}
 	}
-	if ((ino == 0) || (ino > fs->super->s_inodes_count))
-		return EXT2_ET_BAD_INODE_NUM;
 	if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
 		inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
 		block_nr = fs->image_header->offset_inode / fs->blocksize;
-- 
1.5.4.3


=====================================================================

Thanks -
Manish
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