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[114.166.45.23]) by smtp.gmail.com with ESMTPSA id r1sm19466242pjp.29.2019.12.23.01.06.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Dec 2019 01:06:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=etsukata-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LxG3wd+JkDnvw8rUQlHr+glYrc/y7je8jBeo318Kmpw=; b=1z3/Pq0jhs/0Gm59/Bl4pvknRJfRKkoMWr787pFN1u+/459OgyJs4lWFoOHn16+NCr P+RjaaB7X1XXAuPNeZVUegOCjIQ4gwYR0gM9QcDtBiqycVV9ZZbGT5oCGNMuWc+EJ0hv O/S7PwRrAumkC6wDnmBFpmTPsmvisSMchpVSzwMXhKO9xqJCsWx7an6TX311n91b3Mk5 xY8DtMtS1nKMYUnkUJvrx7XP9k1PR99GWlKkwUJjIXXGXs03e2NWfK4HKVOnIPBbz2kd Lq5qQRXtUctkPAToZxQdzCVz2QqDD+CerUYD7b8kJBc3SMNKmt8KoRj9XwTKTxk++XZK Fl8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LxG3wd+JkDnvw8rUQlHr+glYrc/y7je8jBeo318Kmpw=; b=W+l00tOtn9ph8soJarhpPwoF/n+zPVjcDI/veudQK1pcQDaGRj+mbLgmqJfmJYmYEn tLdIuGhbAC76TUBByFJ/qeVEw6eOAlYnCYFW4GxKZ9dZGxxXOF3Y3zgPNZkshOOaMoWg v8sxdUXKXtZnvmFDf8cTgG0qA5KhCuTTGwahvUdmnUpYB3raIphmlAwhc2RndESgTwTp YPyJMnYw0xeGCUsSGM80RIhELnWpKaT84Doi3PtSwTrQAkY40eFuUFBHuCzXDWBvcyd7 aEtZUWIKcg5Ns/eOvQcksg2yv7sBlwj9jxdUeGpx5CUH6/B9FRnoxSgjuA2LcIL8BxcV owWg== X-Gm-Message-State: APjAAAUNpHGURV9Ko7gujs2idbUbJogYsyrv3w2V7t1UK0RW6svl+dYo hLdEjh773zoO7437v9gR7fB8Ew== X-Google-Smtp-Source: APXvYqyOZJ/C4M39HQ8Rps4SWb2kPASSnO+XeiyHJFC6iYI2DiRuzTwaEaXSDB413qwUMCuNG4JdpQ== X-Received: by 2002:a63:89c2:: with SMTP id v185mr29525920pgd.135.1577092017039; Mon, 23 Dec 2019 01:06:57 -0800 (PST) From: Eiichi Tsukata To: kwolf@redhat.com, mreitz@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org, vsementsov@virtuozzo.com Subject: [PATCH] block/backup: fix memory leak in bdrv_backup_top_append() Date: Mon, 23 Dec 2019 18:06:32 +0900 Message-Id: <20191223090632.30653-1-devel@etsukata.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::543 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eiichi Tsukata Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @etsukata-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" bdrv_open_driver() allocates bs->opaque according to drv->instance_size. There is no need to allocate it and overwrite opaque in bdrv_backup_top_append(). Reproducer: $ QTEST_QEMU_BINARY=3D./x86_64-softmmu/qemu-system-x86_64 valgrind -q --l= eak-check=3Dfull tests/test-replication -p /replication/secondary/start =3D=3D29792=3D=3D 24 bytes in 1 blocks are definitely lost in loss record= 52 of 226 =3D=3D29792=3D=3D at 0x483AB1A: calloc (vg_replace_malloc.c:762) =3D=3D29792=3D=3D by 0x4B07CE0: g_malloc0 (in /usr/lib64/libglib-2.0.s= o.0.6000.7) =3D=3D29792=3D=3D by 0x12BAB9: bdrv_open_driver (block.c:1289) =3D=3D29792=3D=3D by 0x12BEA9: bdrv_new_open_driver (block.c:1359) =3D=3D29792=3D=3D by 0x1D15CB: bdrv_backup_top_append (backup-top.c:19= 0) =3D=3D29792=3D=3D by 0x1CC11A: backup_job_create (backup.c:439) =3D=3D29792=3D=3D by 0x1CD542: replication_start (replication.c:544) =3D=3D29792=3D=3D by 0x1401B9: replication_start_all (replication.c:52) =3D=3D29792=3D=3D by 0x128B50: test_secondary_start (test-replication.= c:427) ... Fixes: 7df7868b9640 ("block: introduce backup-top filter driver") Signed-off-by: Eiichi Tsukata Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/backup-top.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/backup-top.c b/block/backup-top.c index 7cdb1f8eba..617217374d 100644 --- a/block/backup-top.c +++ b/block/backup-top.c @@ -196,7 +196,7 @@ BlockDriverState *bdrv_backup_top_append(BlockDriverSta= te *source, } =20 top->total_sectors =3D source->total_sectors; - top->opaque =3D state =3D g_new0(BDRVBackupTopState, 1); + state =3D top->opaque; =20 bdrv_ref(target); state->target =3D bdrv_attach_child(top, target, "target", &child_file= , errp); --=20 2.21.0