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Message-Id: <1240110228-22781-4-git-send-email-tytso@mit.edu> Date: Sat, 18 Apr 2009 23:03:48 -0400 From: Theodore Ts'o <tytso@....edu> To: linux-ext4@...r.kernel.org Cc: sandeen@...hat.com, Theodore Ts'o <tytso@....edu> Subject: [PATCH 3/3] resize2fs: Fix corruption bug impacting ext4 filesystems with uninit_bg Due to a fencepost bug, when skipping a block group whose block bitmap was uninitialized (and hence could not contain any blocks eligible for relaocation), the block immediately following the block group wasn't checked as well. If it was in use and required relocation, it wouldn't get properly relocated, with the result that an inode using such a block would end up, post resize, with a pointer to a block now outside the bounds of the filesystem. This commit fixes this fencepost error. Signed-off-by: "Theodore Ts'o" <tytso@....edu> --- resize/resize2fs.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/resize/resize2fs.c b/resize/resize2fs.c index ac926ce..f3e7fd0 100644 --- a/resize/resize2fs.c +++ b/resize/resize2fs.c @@ -804,7 +804,7 @@ static errcode_t blocks_to_move(ext2_resize_t rfs) * to the next block group. */ blk = ((g+1) * fs->super->s_blocks_per_group) + - fs->super->s_first_data_block; + fs->super->s_first_data_block - 1; continue; } if (ext2fs_test_block_bitmap(old_fs->block_map, blk) && -- 1.5.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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