From: Peter Jones <pjo...@redhat.com>
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 <pjo...@redhat.com>
Reviewed-by: Darren Kenny <darren.ke...@oracle.com>
Reviewed-by: Daniel Kiper <daniel.ki...@oracle.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;
--
2.11.0
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