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Message-ID: <20140718225348.31374.59045.stgit@birch.djwong.org> Date: Fri, 18 Jul 2014 15:53:48 -0700 From: "Darrick J. Wong" <darrick.wong@...cle.com> To: tytso@....edu, darrick.wong@...cle.com Cc: linux-ext4@...r.kernel.org Subject: [PATCH 13/24] e2fsck: fix off-by-one bounds check on group number Since fs->group_desc_count is the number of block groups, the number of the last group is always one less than this count. Fix the bounds check to reflect that. This flaw shouldn't have any user-visible side effects, since the block bitmap test based on last_grp later on can handle overbig block numbers. Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com> --- e2fsck/pass1.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c index 5ad7fe5..eec93c3 100644 --- a/e2fsck/pass1.c +++ b/e2fsck/pass1.c @@ -2916,8 +2916,8 @@ static void new_table_block(e2fsck_t ctx, blk64_t first_block, dgrp_t group, first_block = ext2fs_group_first_block2(fs, flexbg_size * flexbg); last_grp = group | (flexbg_size - 1); - if (last_grp > fs->group_desc_count) - last_grp = fs->group_desc_count; + if (last_grp >= fs->group_desc_count) + last_grp = fs->group_desc_count - 1; last_block = ext2fs_group_last_block2(fs, last_grp); } else last_block = ext2fs_group_last_block2(fs, group); -- 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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