linux-ext4 - [PATCH 19/21] e2fsck: be more careful in assuming inline

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Date:	Mon, 04 Aug 2014 18:07:03 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 19/21] e2fsck: be more careful in assuming inline_data
 inodes are directories

If a file is marked inline_data but its i_size isn't a multiple of
four, it probably isn't an inline directory, because directory entries
have sizes that are multiples of four.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 e2fsck/pass1.c |    7 +++++++
 1 file changed, 7 insertions(+)


diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 1a9e0d5..245a755 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -536,10 +536,17 @@ static void check_is_really_dir(e2fsck_t ctx, struct problem_context *pctx,
 	inlinedata_fs = (ctx->fs->super->s_feature_incompat &
 			 EXT4_FEATURE_INCOMPAT_INLINE_DATA);
 	if (inlinedata_fs && (inode->i_flags & EXT4_INLINE_DATA_FL)) {
+		int flags;
 		size_t size;
 
 		if (ext2fs_inline_data_size(ctx->fs, pctx->ino, &size))
 			return;
+		/*
+		 * If the size isn't a multiple of 4, it's probably not a
+		 * directory??
+		 */
+		if (size & 3)
+			return;
 		/* device files never have a "system.data" entry */
 		goto isdir;
 	} else if (extent_fs && (inode->i_flags & EXT4_EXTENTS_FL)) {

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