Blame SOURCES/0286-iso9660-Don-t-leak-memory-on-realloc-failures.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Sat, 4 Jul 2020 12:25:09 -0400
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Subject: [PATCH] iso9660: Don't leak memory on realloc() failures
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Signed-off-by: Peter Jones <pjones@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream-commit-id: f2bd30b2fe7
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---
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 grub-core/fs/iso9660.c | 24 ++++++++++++++++++++----
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 1 file changed, 20 insertions(+), 4 deletions(-)
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diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
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index f45841e2b..6fc9302bc 100644
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--- a/grub-core/fs/iso9660.c
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+++ b/grub-core/fs/iso9660.c
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@@ -533,14 +533,20 @@ add_part (struct iterate_dir_ctx *ctx,
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 {
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   int size = ctx->symlink ? grub_strlen (ctx->symlink) : 0;
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   grub_size_t sz;
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+  char *new;
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   if (grub_add (size, len2, &sz) ||
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       grub_add (sz, 1, &sz))
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     return;
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-  ctx->symlink = grub_realloc (ctx->symlink, sz);
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-  if (! ctx->symlink)
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-    return;
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+  new = grub_realloc (ctx->symlink, sz);
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+  if (!new)
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+    {
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+      grub_free (ctx->symlink);
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+      ctx->symlink = NULL;
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+      return;
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+    }
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+  ctx->symlink = new;
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   grub_memcpy (ctx->symlink + size, part, len2);
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   ctx->symlink[size + len2] = 0;  
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@@ -634,7 +640,12 @@ susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
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 		   is the length.  Both are part of the `Component
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 		   Record'.  */
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 		if (ctx->symlink && !ctx->was_continue)
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-		  add_part (ctx, "/", 1);
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+		  {
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+		    add_part (ctx, "/", 1);
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+		    if (grub_errno)
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+		      return grub_errno;
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+		  }
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+
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 		add_part (ctx, (char *) &entry->data[pos + 2],
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 			  entry->data[pos + 1]);
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 		ctx->was_continue = (entry->data[pos] & 1);
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@@ -653,6 +664,11 @@ susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
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 	      add_part (ctx, "/", 1);
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 	      break;
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 	    }
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+
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+	  /* Check if grub_realloc() failed in add_part(). */
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+	  if (grub_errno)
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+	    return grub_errno;
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+
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 	  /* In pos + 1 the length of the `Component Record' is
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 	     stored.  */
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 	  pos += entry->data[pos + 1] + 2;