grub: fix a memory leak

Add a fix for a memory leak in grub's disk/ldm. It is a part of
a security series [1].

[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html

Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 129 insertions, 0 deletions

diff --git a/meta/recipes-bsp/grub/files/0016-disk-ldm-Make-sure-comp-data-is-freed-before-exiting.patch b/meta/recipes-bsp/grub/files/0016-disk-ldm-Make-sure-comp-data-is-freed-before-exiting.patch
new file mode 100644
index 0000000000..c1687c75d0
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/0016-disk-ldm-Make-sure-comp-data-is-freed-before-exiting.patch
@@ -0,0 +1,128 @@
+From 0c5d0fd796e6cafba179321de396681a493c4158 Mon Sep 17 00:00:00 2001
+From: Marco A Benatto <mbenatto@redhat.com>
+Date: Mon, 7 Dec 2020 11:53:03 -0300
+Subject: [PATCH] disk/ldm: Make sure comp data is freed before exiting from
+ make_vg()
+
+Several error handling paths in make_vg() do not free comp data before
+jumping to fail2 label and returning from the function. This will leak
+memory. So, let's fix all issues of that kind.
+
+Fixes: CID 73804
+
+Signed-off-by: Marco A Benatto <mbenatto@redhat.com>
+Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
+
+Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=23e39f50ca7a107f6b66396ed4d177a914dee035]
+Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
+---
+ grub-core/disk/ldm.c | 51 ++++++++++++++++++++++++++++++++++++++------
+ 1 file changed, 44 insertions(+), 7 deletions(-)
+
+diff --git a/grub-core/disk/ldm.c b/grub-core/disk/ldm.c
+index 58f8a53..428415f 100644
+--- a/grub-core/disk/ldm.c
++++ b/grub-core/disk/ldm.c
+@@ -554,7 +554,11 @@ make_vg (grub_disk_t disk,
+ 	      comp->segments = grub_calloc (comp->segment_alloc,
+ 					    sizeof (*comp->segments));
+ 	      if (!comp->segments)
+-		goto fail2;
++		{
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	    }
+ 	  else
+ 	    {
+@@ -562,7 +566,11 @@ make_vg (grub_disk_t disk,
+ 	      comp->segment_count = 1;
+ 	      comp->segments = grub_malloc (sizeof (*comp->segments));
+ 	      if (!comp->segments)
+-		goto fail2;
++		{
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	      comp->segments->start_extent = 0;
+ 	      comp->segments->extent_count = lv->size;
+ 	      comp->segments->layout = 0;
+@@ -574,15 +582,26 @@ make_vg (grub_disk_t disk,
+ 		  comp->segments->layout = GRUB_RAID_LAYOUT_SYMMETRIC_MASK;
+ 		}
+ 	      else
+-		goto fail2;
++		{
++		  grub_free (comp->segments);
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	      ptr += *ptr + 1;
+ 	      ptr++;
+ 	      if (!(vblk[i].flags & 0x10))
+-		goto fail2;
++		{
++		  grub_free (comp->segments);
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	      if (ptr >= vblk[i].dynamic + sizeof (vblk[i].dynamic)
+ 		  || ptr + *ptr + 1 >= vblk[i].dynamic
+ 		  + sizeof (vblk[i].dynamic))
+ 		{
++		  grub_free (comp->segments);
+ 		  grub_free (comp->internal_id);
+ 		  grub_free (comp);
+ 		  goto fail2;
+@@ -592,6 +611,7 @@ make_vg (grub_disk_t disk,
+ 	      if (ptr + *ptr + 1 >= vblk[i].dynamic
+ 		  + sizeof (vblk[i].dynamic))
+ 		{
++		  grub_free (comp->segments);
+ 		  grub_free (comp->internal_id);
+ 		  grub_free (comp);
+ 		  goto fail2;
+@@ -601,7 +621,12 @@ make_vg (grub_disk_t disk,
+ 	      comp->segments->nodes = grub_calloc (comp->segments->node_alloc,
+ 						   sizeof (*comp->segments->nodes));
+ 	      if (!lv->segments->nodes)
+-		goto fail2;
++		{
++		  grub_free (comp->segments);
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	    }
+ 
+ 	  if (lv->segments->node_alloc == lv->segments->node_count)
+@@ -611,11 +636,23 @@ make_vg (grub_disk_t disk,
+ 
+ 	      if (grub_mul (lv->segments->node_alloc, 2, &lv->segments->node_alloc) ||
+ 		  grub_mul (lv->segments->node_alloc, sizeof (*lv->segments->nodes), &sz))
+-		goto fail2;
++		{
++		  grub_free (comp->segments->nodes);
++		  grub_free (comp->segments);
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 
+ 	      t = grub_realloc (lv->segments->nodes, sz);
+ 	      if (!t)
+-		goto fail2;
++		{
++		  grub_free (comp->segments->nodes);
++		  grub_free (comp->segments);
++		  grub_free (comp->internal_id);
++		  grub_free (comp);
++		  goto fail2;
++		}
+ 	      lv->segments->nodes = t;
+ 	    }
+ 	  lv->segments->nodes[lv->segments->node_count].pv = 0;
diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index 94b89aa643..479e2f71f2 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -62,6 +62,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
            file://0013-io-lzopio-Resolve-unnecessary-self-assignment-errors.patch \
            file://0014-zstd-Initialize-seq_t-structure-fully.patch \
            file://0015-kern-partition-Check-for-NULL-before-dereferencing-i.patch \
+           file://0016-disk-ldm-Make-sure-comp-data-is-freed-before-exiting.patch \
            "
 SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
 SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"