boot/grub2/0021-hfsplus-Fix-two-more-overflows.patch

From feec993673d8e13fcf22fe2389ac29222b6daebd Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sun, 19 Jul 2020 14:43:31 -0400
Subject: [PATCH] hfsplus: Fix two more overflows
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Both node->size and node->namelen come from the supplied filesystem,
which may be user-supplied. We can't trust them for the math unless we
know they don't overflow. Making sure they go through grub_add() or
grub_calloc() first will give us that.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
---
 grub-core/fs/hfsplus.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index dae43becc..9c4e4c88c 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -31,6 +31,7 @@
 #include <grub/hfs.h>
 #include <grub/charset.h>
 #include <grub/hfsplus.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -475,8 +476,12 @@ grub_hfsplus_read_symlink (grub_fshelp_node_t node)
 {
   char *symlink;
   grub_ssize_t numread;
+  grub_size_t sz = node->size;
 
-  symlink = grub_malloc (node->size + 1);
+  if (grub_add (sz, 1, &sz))
+    return NULL;
+
+  symlink = grub_malloc (sz);
   if (!symlink)
     return 0;
 
@@ -715,8 +720,8 @@ list_nodes (void *record, void *hook_arg)
   if (type == GRUB_FSHELP_UNKNOWN)
     return 0;
 
-  filename = grub_malloc (grub_be_to_cpu16 (catkey->namelen)
-			  * GRUB_MAX_UTF8_PER_UTF16 + 1);
+  filename = grub_calloc (grub_be_to_cpu16 (catkey->namelen),
+			  GRUB_MAX_UTF8_PER_UTF16 + 1);
   if (! filename)
     return 0;
 
-- 
2.26.2