linux-kernel - Re: [PATCH] ext2: skip pages past number of blocks in ext2_find

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Date:	Thu, 21 Dec 2006 13:11:01 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext2: skip pages past number of blocks in ext2_find_entry

Randy Dunlap wrote:

> Please don't hide the goto; un-indent 1 tab stop.
Whoops, thanks Randy - it wasn't intentional. :)

Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Index: linux-2.6.19/fs/ext2/dir.c
===================================================================
--- linux-2.6.19.orig/fs/ext2/dir.c
+++ linux-2.6.19/fs/ext2/dir.c
@@ -368,6 +368,14 @@ struct ext2_dir_entry_2 * ext2_find_entr
 		}
 		if (++n >= npages)
 			n = 0;
+		/* next page is past the blocks we've got */
+		if (unlikely(n > (dir->i_blocks >> (PAGE_CACHE_SHIFT - 9)))) {
+			ext2_error(dir->i_sb, __FUNCTION__,
+				"dir %lu size %lld exceeds block count %llu",
+				dir->i_ino, dir->i_size,
+				(unsigned long long)dir->i_blocks);
+			goto out;
+		}
 	} while (n != start);
 out:
 	return NULL;


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