Blame SOURCES/0409-affs-Fix-memory-leaks.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Thu, 26 Nov 2020 12:48:07 +0000
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Subject: [PATCH] affs: Fix memory leaks
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The node structure reference is being allocated but not freed if it
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reaches the end of the function. If any of the hooks had returned
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a non-zero value, then node would have been copied in to the context
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reference, but otherwise node is not stored and should be freed.
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Similarly, the call to grub_affs_create_node() replaces the allocated
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memory in node with a newly allocated structure, leaking the existing
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memory pointed by node.
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Finally, when dir->parent is set, then we again replace node with newly
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allocated memory, which seems unnecessary when we copy in the values
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from dir->parent immediately after.
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Fixes: CID 73759
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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 grub-core/fs/affs.c | 18 ++++++++----------
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 1 file changed, 8 insertions(+), 10 deletions(-)
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diff --git a/grub-core/fs/affs.c b/grub-core/fs/affs.c
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index 91073795f..e4615c743 100644
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--- a/grub-core/fs/affs.c
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+++ b/grub-core/fs/affs.c
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@@ -400,12 +400,12 @@ grub_affs_iterate_dir (grub_fshelp_node_t dir,
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 {
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   unsigned int i;
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   struct grub_affs_file file;
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-  struct grub_fshelp_node *node = 0;
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+  struct grub_fshelp_node *node, *orig_node;
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   struct grub_affs_data *data = dir->data;
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   grub_uint32_t *hashtable;
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   /* Create the directory entries for `.' and `..'.  */
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-  node = grub_zalloc (sizeof (*node));
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+  node = orig_node = grub_zalloc (sizeof (*node));
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   if (!node)
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     return 1;
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@@ -414,9 +414,6 @@ grub_affs_iterate_dir (grub_fshelp_node_t dir,
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     return 1;
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   if (dir->parent)
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     {
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-      node = grub_zalloc (sizeof (*node));
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-      if (!node)
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-	return 1;
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       *node = *dir->parent;
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       if (hook ("..", GRUB_FSHELP_DIR, node, hook_data))
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 	return 1;
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@@ -456,17 +453,18 @@ grub_affs_iterate_dir (grub_fshelp_node_t dir,
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 	  if (grub_affs_create_node (dir, hook, hook_data, &node, &hashtable,
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 				     next, &file))
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-	    return 1;
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+	    {
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+	      /* Node has been replaced in function. */
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+	      grub_free (orig_node);
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+	      return 1;
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+	    }
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 	  next = grub_be_to_cpu32 (file.next);
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 	}
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     }
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-  grub_free (hashtable);
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-  return 0;
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-
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  fail:
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-  grub_free (node);
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+  grub_free (orig_node);
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   grub_free (hashtable);
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   return 0;
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 }