From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 26 Feb 2017 17:11:36 +0000 (+0100)
Subject: patch 8.0.0377: possible overflow when reading corrupted undo file
X-Git-Tag: v8.0.0377
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3eb1637b1bba19519885dd6d377bd5596e91d22c;p=vim

patch 8.0.0377: possible overflow when reading corrupted undo file

Problem:    Possible overflow when reading corrupted undo file.
Solution:   Check if allocated size is not too big. (King)
---

diff --git a/src/undo.c b/src/undo.c
index b69f31872..ba7c0b83c 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1787,7 +1787,7 @@ u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
     linenr_T	line_lnum;
     colnr_T	line_colnr;
     linenr_T	line_count;
-    int		num_head = 0;
+    long	num_head = 0;
     long	old_header_seq, new_header_seq, cur_header_seq;
     long	seq_last, seq_cur;
     long	last_save_nr = 0;
@@ -1974,7 +1974,8 @@ u_read_undo(char_u *name, char_u *hash, char_u *orig_name)
      * When there are no headers uhp_table is NULL. */
     if (num_head > 0)
     {
-	uhp_table = (u_header_T **)U_ALLOC_LINE(
+	if (num_head < LONG_MAX / (long)sizeof(u_header_T *))
+	    uhp_table = (u_header_T **)U_ALLOC_LINE(
 					     num_head * sizeof(u_header_T *));
 	if (uhp_table == NULL)
 	    goto error;
diff --git a/src/version.c b/src/version.c
index 8d1454197..c79020b21 100644
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    377,
 /**/
     376,
 /**/