linux-ext4 - [RFC PATCH v3 56/61] e2fsck: fix memory leaks with pfsck enabled

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Date:   Wed, 18 Nov 2020 07:39:42 -0800
From:   Saranya Muruganandam <saranyamohan@...gle.com>
To:     linux-ext4@...r.kernel.org, tytso@....edu
Cc:     adilger.kernel@...ger.ca, Wang Shilong <wshilong@....com>,
        Saranya Muruganandam <saranyamohan@...gle.com>
Subject: [RFC PATCH v3 56/61] e2fsck: fix memory leaks with pfsck enabled

From: Wang Shilong <wshilong@....com>

valgrind detected few memory leaks:

1) quota context is not released after merging.
2) three block bufs are not freed in read_bitmaps_range_start()
3) @refcount_orig should be released

Signed-off-by: Wang Shilong <wshilong@....com>
Signed-off-by: Saranya Muruganandam <saranyamohan@...gle.com>
---
 e2fsck/e2fsck.c         |  4 ++++
 e2fsck/pass1.c          |  1 +
 lib/ext2fs/rw_bitmaps.c | 14 ++++----------
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/e2fsck/e2fsck.c b/e2fsck/e2fsck.c
index a03550c0..e406f6dd 100644
--- a/e2fsck/e2fsck.c
+++ b/e2fsck/e2fsck.c
@@ -102,6 +102,10 @@ errcode_t e2fsck_reset_context(e2fsck_t ctx)
 		ea_refcount_free(ctx->refcount_extra);
 		ctx->refcount_extra = 0;
 	}
+	if (ctx->refcount_orig) {
+		ea_refcount_free(ctx->refcount_orig);
+		ctx->refcount_orig = 0;
+	}
 	if (ctx->ea_block_quota_blocks) {
 		ea_refcount_free(ctx->ea_block_quota_blocks);
 		ctx->ea_block_quota_blocks = 0;
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 70826866..7768119b 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -3113,6 +3113,7 @@ static int e2fsck_pass1_thread_join(e2fsck_t global_ctx, e2fsck_t thread_ctx)
 		fclose(thread_ctx->problem_logf);
 	}
 
+	quota_release_context(&thread_ctx->qctx);
 	/*
 	 * @block_metadata_map and @block_dup_map are
 	 * shared, so we don't free them.
diff --git a/lib/ext2fs/rw_bitmaps.c b/lib/ext2fs/rw_bitmaps.c
index eb791202..5fde2632 100644
--- a/lib/ext2fs/rw_bitmaps.c
+++ b/lib/ext2fs/rw_bitmaps.c
@@ -269,7 +269,7 @@ static errcode_t read_bitmaps_range_start(ext2_filsys fs, int do_inode, int do_b
 	dgrp_t i;
 	char *block_bitmap = 0, *inode_bitmap = 0;
 	char *buf;
-	errcode_t retval;
+	errcode_t retval = 0;
 	int block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8;
 	int inode_nbytes = EXT2_INODES_PER_GROUP(fs->super) / 8;
 	int tail_flags = 0;
@@ -432,18 +432,12 @@ static errcode_t read_bitmaps_range_start(ext2_filsys fs, int do_inode, int do_b
 
 success_cleanup:
 	if (start == 0 && end == fs->group_desc_count - 1) {
-		if (inode_bitmap) {
-			ext2fs_free_mem(&inode_bitmap);
+		if (inode_bitmap)
 			fs->flags &= ~EXT2_FLAG_IBITMAP_TAIL_PROBLEM;
-		}
-		if (block_bitmap) {
-			ext2fs_free_mem(&block_bitmap);
+		if (block_bitmap)
 			fs->flags &= ~EXT2_FLAG_BBITMAP_TAIL_PROBLEM;
-		}
 	}
 	fs->flags |= tail_flags;
-	return 0;
-
 cleanup:
 	if (inode_bitmap)
 		ext2fs_free_mem(&inode_bitmap);
@@ -451,8 +445,8 @@ cleanup:
 		ext2fs_free_mem(&block_bitmap);
 	if (buf)
 		ext2fs_free_mem(&buf);
-	return retval;
 
+	return retval;
 }
 
 static errcode_t read_bitmaps_range_end(ext2_filsys fs, int do_inode, int do_block,
-- 
2.29.2.299.gdc1121823c-goog