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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Marco A Benatto <mbenatto@redhat.com>
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Date: Mon, 30 Nov 2020 12:18:24 -0300
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Subject: [PATCH] loader/xnu: Free driverkey data when an error is detected in
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grub_xnu_writetree_toheap()
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... to avoid memory leaks.
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Fixes: CID 96640
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Signed-off-by: Marco A Benatto <mbenatto@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/loader/xnu.c | 24 ++++++++++++++++++++----
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1 file changed, 20 insertions(+), 4 deletions(-)
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diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
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index 16bfa7cec..af885a648 100644
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--- a/grub-core/loader/xnu.c
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+++ b/grub-core/loader/xnu.c
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@@ -228,26 +228,33 @@ grub_xnu_writetree_toheap (grub_addr_t *target, grub_size_t *size)
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if (! memorymap)
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return grub_errno;
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- driverkey = (struct grub_xnu_devtree_key *) grub_malloc (sizeof (*driverkey));
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+ driverkey = (struct grub_xnu_devtree_key *) grub_zalloc (sizeof (*driverkey));
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if (! driverkey)
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return grub_errno;
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driverkey->name = grub_strdup ("DeviceTree");
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if (! driverkey->name)
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- return grub_errno;
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+ {
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+ err = grub_errno;
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+ goto fail;
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+ }
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+
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driverkey->datasize = sizeof (*extdesc);
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driverkey->next = memorymap->first_child;
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memorymap->first_child = driverkey;
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driverkey->data = extdesc
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= (struct grub_xnu_extdesc *) grub_malloc (sizeof (*extdesc));
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if (! driverkey->data)
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- return grub_errno;
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+ {
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+ err = grub_errno;
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+ goto fail;
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+ }
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/* Allocate the space based on the size with dummy value. */
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*size = grub_xnu_writetree_get_size (grub_xnu_devtree_root, "/");
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err = grub_xnu_heap_malloc (ALIGN_UP (*size + 1, GRUB_XNU_PAGESIZE),
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&src, target);
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if (err)
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- return err;
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+ goto fail;
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/* Put real data in the dummy. */
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extdesc->addr = *target;
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@@ -256,6 +263,15 @@ grub_xnu_writetree_toheap (grub_addr_t *target, grub_size_t *size)
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/* Write the tree to heap. */
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grub_xnu_writetree_toheap_real (src, grub_xnu_devtree_root, "/");
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return GRUB_ERR_NONE;
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+
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+ fail:
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+ memorymap->first_child = NULL;
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+
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+ grub_free (driverkey->data);
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+ grub_free (driverkey->name);
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+ grub_free (driverkey);
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+
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+ return err;
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}
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/* Find a key or value in parent key. */
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