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[lvm-devel] [PATCH] Fix vg_read() error paths to properly release upon vg_read_error().



Fix vg_read() error paths to properly release upon vg_read_error().
Note that in the iterator paths (process_each_*()), we release
inside the iterator so no individual cleanup is needed.  However there
are a number of other places we missed the cleanup.  Proper cleanup
when vg_read_error() is true should be calling vg_release(vg), since
there should be no locks held if we get an error (except in certain
special cases, which IMO we should work to remove from the code).

Unfortunately the testsuite is unable to detect these types of memory
leaks.  Most of them can be easily seen if you try an operation
(e.g. lvcreate) with a volume group that does not exist.  Error
message looks like this:
  Volume group "vg2" not found
  You have a memory leak (not released memory pool):
   [0x1975eb8]
  You have a memory leak (not released memory pool):
   [0x1975eb8]

Signed-off-by: Dave Wysochanski <dwysocha redhat com>
---
 tools/lvcreate.c   |    4 +++-
 tools/lvrename.c   |    4 +++-
 tools/lvresize.c   |    1 +
 tools/polldaemon.c |    1 +
 tools/pvchange.c   |    4 +++-
 tools/pvmove.c     |    1 +
 tools/pvresize.c   |    4 ++--
 tools/toollib.c    |    1 +
 tools/vgextend.c   |    1 +
 tools/vgmerge.c    |    7 +++++--
 tools/vgrename.c   |    4 +++-
 tools/vgsplit.c    |    4 +++-
 12 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/tools/lvcreate.c b/tools/lvcreate.c
index 030aa0c..70f237a 100644
--- a/tools/lvcreate.c
+++ b/tools/lvcreate.c
@@ -995,8 +995,10 @@ int lvcreate(struct cmd_context *cmd, int argc, char **argv)
 
 	log_verbose("Finding volume group \"%s\"", lp.vg_name);
 	vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0);
-	if (vg_read_error(vg))
+	if (vg_read_error(vg)) {
+		vg_release(vg);
 		return ECMD_FAILED;
+	}
 
 	if (!_lvcreate(cmd, vg, &lp))
 		r = ECMD_FAILED;
diff --git a/tools/lvrename.c b/tools/lvrename.c
index 53ea116..7411854 100644
--- a/tools/lvrename.c
+++ b/tools/lvrename.c
@@ -103,8 +103,10 @@ int lvrename(struct cmd_context *cmd, int argc, char **argv)
 
 	log_verbose("Checking for existing volume group \"%s\"", vg_name);
 	vg = vg_read_for_update(cmd, vg_name, NULL, 0);
-	if (vg_read_error(vg))
+	if (vg_read_error(vg)) {
+		vg_release(vg);
 		return ECMD_FAILED;
+	}
 
 	if (!(lvl = find_lv_in_vg(vg, lv_name_old))) {
 		log_error("Existing logical volume \"%s\" not found in "
diff --git a/tools/lvresize.c b/tools/lvresize.c
index b558792..033078f 100644
--- a/tools/lvresize.c
+++ b/tools/lvresize.c
@@ -673,6 +673,7 @@ int lvresize(struct cmd_context *cmd, int argc, char **argv)
 	log_verbose("Finding volume group %s", lp.vg_name);
 	vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0);
 	if (vg_read_error(vg)) {
+		vg_release(vg);
 		stack;
 		return ECMD_FAILED;
 	}
diff --git a/tools/polldaemon.c b/tools/polldaemon.c
index 8c5c7da..4dcbc22 100644
--- a/tools/polldaemon.c
+++ b/tools/polldaemon.c
@@ -150,6 +150,7 @@ static int _wait_for_single_mirror(struct cmd_context *cmd, const char *name, co
 		/* Locks the (possibly renamed) VG again */
 		vg = parms->poll_fns->get_copy_vg(cmd, name, uuid);
 		if (vg_read_error(vg)) {
+			vg_release(vg);
 			log_error("ABORTING: Can't reread VG for %s", name);
 			/* What more could we do here? */
 			return 0;
diff --git a/tools/pvchange.c b/tools/pvchange.c
index 1c9d394..efc780b 100644
--- a/tools/pvchange.c
+++ b/tools/pvchange.c
@@ -58,8 +58,10 @@ static int _pvchange_single(struct cmd_context *cmd, struct physical_volume *pv,
 		log_verbose("Finding volume group %s of physical volume %s",
 			    vg_name, pv_name);
 		vg = vg_read_for_update(cmd, vg_name, NULL, 0);
-		if (vg_read_error(vg))
+		if (vg_read_error(vg)) {
+			vg_release(vg);
 			return_0;
+		}
 
 		if (!(pvl = find_pv_in_vg(vg, pv_name))) {
 			log_error
diff --git a/tools/pvmove.c b/tools/pvmove.c
index d288e6f..65b7606 100644
--- a/tools/pvmove.c
+++ b/tools/pvmove.c
@@ -387,6 +387,7 @@ static int _set_up_pvmove(struct cmd_context *cmd, const char *pv_name,
 
 	vg = _get_vg(cmd, pv_vg_name(pv));
 	if (vg_read_error(vg)) {
+		vg_release(vg);
 		stack;
 		return ECMD_FAILED;
 	}
diff --git a/tools/pvresize.c b/tools/pvresize.c
index 336da9a..964d6a5 100644
--- a/tools/pvresize.c
+++ b/tools/pvresize.c
@@ -100,7 +100,7 @@ static int _pv_resize_single(struct cmd_context *cmd,
 		log_error("%s: Couldn't get size.", pv_name);
 		goto bad;
 	}
-	
+
 	if (new_size) {
 		if (new_size > size)
 			log_warn("WARNING: %s: Overriding real size. "
@@ -127,7 +127,7 @@ static int _pv_resize_single(struct cmd_context *cmd,
 	if (vg) {
 		pv->size -= pv_pe_start(pv);
 		new_pe_count = pv_size(pv) / vg->extent_size;
-		
+
  		if (!new_pe_count) {
 			log_error("%s: Size must leave space for at "
 				  "least one physical extent of "
diff --git a/tools/toollib.c b/tools/toollib.c
index 1fe9249..248fafb 100644
--- a/tools/toollib.c
+++ b/tools/toollib.c
@@ -354,6 +354,7 @@ int process_each_segment_in_pv(struct cmd_context *cmd,
 
 		vg = vg_read(cmd, vg_name, NULL, 0);
 		if (vg_read_error(vg)) {
+			vg_release(vg);
 			log_error("Skipping volume group %s", vg_name);
 			return ECMD_FAILED;
 		}
diff --git a/tools/vgextend.c b/tools/vgextend.c
index 5692582..1000dc2 100644
--- a/tools/vgextend.c
+++ b/tools/vgextend.c
@@ -45,6 +45,7 @@ int vgextend(struct cmd_context *cmd, int argc, char **argv)
 	vg = vg_read_for_update(cmd, vg_name, NULL,
 				READ_REQUIRE_RESIZEABLE | LOCK_NONBLOCKING);
 	if (vg_read_error(vg)) {
+		vg_release(vg);
 		unlock_vg(cmd, VG_ORPHANS);
 		return ECMD_FAILED;
 	}
diff --git a/tools/vgmerge.c b/tools/vgmerge.c
index 3ed6c50..4a9e377 100644
--- a/tools/vgmerge.c
+++ b/tools/vgmerge.c
@@ -29,13 +29,16 @@ static int _vgmerge_single(struct cmd_context *cmd, const char *vg_name_to,
 
 	log_verbose("Checking for volume group \"%s\"", vg_name_to);
 	vg_to = vg_read_for_update(cmd, vg_name_to, NULL, 0);
-	if (vg_read_error(vg_to))
-		 return ECMD_FAILED;
+	if (vg_read_error(vg_to)) {
+		vg_release(vg_to);
+		return ECMD_FAILED;
+	}
 
 	log_verbose("Checking for volume group \"%s\"", vg_name_from);
 	vg_from = vg_read_for_update(cmd, vg_name_from, NULL,
 				     LOCK_NONBLOCKING);
 	if (vg_read_error(vg_from)) {
+		vg_release(vg_from);
 		unlock_and_release_vg(cmd, vg_to, vg_name_to);
 		return ECMD_FAILED;
 	}
diff --git a/tools/vgrename.c b/tools/vgrename.c
index 4d115d0..57229e7 100644
--- a/tools/vgrename.c
+++ b/tools/vgrename.c
@@ -73,8 +73,10 @@ static int vg_rename_path(struct cmd_context *cmd, const char *old_vg_path,
 	/* FIXME we used to print an error about EXPORTED, but proceeded
 	   nevertheless. */
 	vg = vg_read_for_update(cmd, vg_name_old, vgid, READ_ALLOW_EXPORTED);
-	if (vg_read_error(vg))
+	if (vg_read_error(vg)) {
+		vg_release(vg);
 		return_0;
+	}
 
 	if (lvs_in_vg_activated_by_uuid_only(vg)) {
 		unlock_and_release_vg(cmd, vg, vg_name_old);
diff --git a/tools/vgsplit.c b/tools/vgsplit.c
index bd9e8ec..9cd90b8 100644
--- a/tools/vgsplit.c
+++ b/tools/vgsplit.c
@@ -317,8 +317,10 @@ int vgsplit(struct cmd_context *cmd, int argc, char **argv)
 
 	vg_from = vg_read_for_update(cmd, vg_name_from, NULL,
 				     READ_REQUIRE_RESIZEABLE);
-	if (vg_read_error(vg_from))
+	if (vg_read_error(vg_from)) {
+		vg_release(vg_from);
 		return ECMD_FAILED;
+	}
 
 	log_verbose("Checking for new volume group \"%s\"", vg_name_to);
 	/*
-- 
1.6.0.6


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