ext3: fix start and len arguments handling in ext3_trim_fs()

The overflow might happen when passing blocknr into
ext3_get_group_no_and_offset(), because it expects type ext3_fsblk_t
which might be smaller than uint64_t. This will most likely happen when
calling FITRIM with the default argument len = ULLONG_MAX.

Fix this by using "end" variable instead of "start+len" as it is easier
to get right and specifically check that the end is not beyond the end
of the file system, so we are sure that the result of
get_group_no_and_offset() will not overflow. Otherwise truncate it to
the size of the file system.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/ext3/balloc.c

@@ -1973,7 +1973,7 @@ static ext3_grpblk_t ext3_trim_all_free(struct super_block *sb,
 	sbi = EXT3_SB(sb);
 
 	 /* Walk through the whole group */
-	while (start < max) {
+	while (start <= max) {
 		start = bitmap_search_next_usable_block(start, bitmap_bh, max);
 		if (start < 0)
 			break;
@@ -1983,7 +1983,7 @@ static ext3_grpblk_t ext3_trim_all_free(struct super_block *sb,
 		 * Allocate contiguous free extents by setting bits in the
 		 * block bitmap
 		 */
-		while (next < max
+		while (next <= max
 			&& claim_block(sb_bgl_lock(sbi, group),
 					next, bitmap_bh)) {
 			next++;
@@ -2094,73 +2094,74 @@ static ext3_grpblk_t ext3_trim_all_free(struct super_block *sb,
  */
 int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range)
 {
-	ext3_grpblk_t last_block, first_block, free_blocks;
-	unsigned long first_group, last_group;
-	unsigned long group, ngroups;
+	ext3_grpblk_t last_block, first_block;
+	unsigned long group, first_group, last_group;
 	struct ext3_group_desc *gdp;
 	struct ext3_super_block *es = EXT3_SB(sb)->s_es;
-	uint64_t start, len, minlen, trimmed;
+	uint64_t start, minlen, end, trimmed = 0;
+	ext3_fsblk_t first_data_blk =
+			le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
 	ext3_fsblk_t max_blks = le32_to_cpu(es->s_blocks_count);
 	int ret = 0;
 
-	start = (range->start >> sb->s_blocksize_bits) +
-		le32_to_cpu(es->s_first_data_block);
-	len = range->len >> sb->s_blocksize_bits;
+	start = range->start >> sb->s_blocksize_bits;
+	end = start + (range->len >> sb->s_blocksize_bits) - 1;
 	minlen = range->minlen >> sb->s_blocksize_bits;
-	trimmed = 0;
 
-	if (unlikely(minlen > EXT3_BLOCKS_PER_GROUP(sb)))
+	if (unlikely(minlen > EXT3_BLOCKS_PER_GROUP(sb)) ||
+	    unlikely(start >= max_blks))
 		return -EINVAL;
-	if (start >= max_blks)
-		return -EINVAL;
-	if (start + len > max_blks)
-		len = max_blks - start;
+	if (end >= max_blks)
+		end = max_blks - 1;
+	if (end <= first_data_blk)
+		goto out;
+	if (start < first_data_blk)
+		start = first_data_blk;
 
-	ngroups = EXT3_SB(sb)->s_groups_count;
 	smp_rmb();
 
 	/* Determine first and last group to examine based on start and len */
 	ext3_get_group_no_and_offset(sb, (ext3_fsblk_t) start,
 				     &first_group, &first_block);
-	ext3_get_group_no_and_offset(sb, (ext3_fsblk_t) (start + len),
+	ext3_get_group_no_and_offset(sb, (ext3_fsblk_t) end,
 				     &last_group, &last_block);
-	last_group = (last_group > ngroups - 1) ? ngroups - 1 : last_group;
-	last_block = EXT3_BLOCKS_PER_GROUP(sb);
 
-	if (first_group > last_group)
-		return -EINVAL;
+	/* end now represents the last block to discard in this group */
+	end = EXT3_BLOCKS_PER_GROUP(sb) - 1;
 
 	for (group = first_group; group <= last_group; group++) {
 		gdp = ext3_get_group_desc(sb, group, NULL);
 		if (!gdp)
 			break;
 
-		free_blocks = le16_to_cpu(gdp->bg_free_blocks_count);
-		if (free_blocks < minlen)
-			continue;
-
 		/*
 		 * For all the groups except the last one, last block will
-		 * always be EXT3_BLOCKS_PER_GROUP(sb), so we only need to
-		 * change it for the last group in which case first_block +
-		 * len < EXT3_BLOCKS_PER_GROUP(sb).
+		 * always be EXT3_BLOCKS_PER_GROUP(sb)-1, so we only need to
+		 * change it for the last group, note that last_block is
+		 * already computed earlier by ext3_get_group_no_and_offset()
 		 */
-		if (first_block + len < EXT3_BLOCKS_PER_GROUP(sb))
-			last_block = first_block + len;
-		len -= last_block - first_block;
+		if (group == last_group)
+			end = last_block;
 
+		if (le16_to_cpu(gdp->bg_free_blocks_count) >= minlen) {
 			ret = ext3_trim_all_free(sb, group, first_block,
-					last_block, minlen);
+						 end, minlen);
 			if (ret < 0)
 				break;
-
 			trimmed += ret;
+		}
+
+		/*
+		 * For every group except the first one, we are sure
+		 * that the first block to discard will be block #0.
+		 */
 		first_block = 0;
 	}
 
-	if (ret >= 0)
+	if (ret > 0)
 		ret = 0;
-	range->len = trimmed * sb->s_blocksize;
 
+out:
+	range->len = trimmed * sb->s_blocksize;
 	return ret;
 }