Merge pull request #4096 from justinmk/coverity125476

coverity/125476: RI: Null pointer dereference

src/nvim/eval.c

@@ -10822,15 +10822,15 @@ static void f_globpath(typval_T *argvars, typval_T *rettv)
   }
 }
 
-/*
- * "glob2regpat()" function
- */
+// "glob2regpat()" function
 static void f_glob2regpat(typval_T *argvars, typval_T *rettv)
 {
-    char_u	*pat = get_tv_string_chk(&argvars[0]);
+  char_u *pat = get_tv_string_chk(&argvars[0]);  // NULL on type error
 
   rettv->v_type = VAR_STRING;
-    rettv->vval.v_string = file_pat_to_reg_pat(pat, NULL, NULL, FALSE);
+  rettv->vval.v_string = (pat == NULL)
+    ? NULL
+    : file_pat_to_reg_pat(pat, NULL, NULL, false);
 }
 
 /*

src/nvim/fileio.c

@@ -7106,6 +7106,7 @@ char_u * file_pat_to_reg_pat(
     char *allow_dirs,        // Result passed back out in here
     int no_bslash            // Don't use a backward slash as pathsep
 )
+  FUNC_ATTR_NONNULL_ARG(1)
 {
   const char_u *endp;
   char_u      *reg_pat;
@@ -7118,6 +7119,10 @@ char_u * file_pat_to_reg_pat(
   if (pat_end == NULL)
     pat_end = pat + STRLEN(pat);
 
+  if (pat_end == pat) {
+    return (char_u *)xstrdup("^$");
+  }
+
   size_t size = 2;  // '^' at start, '$' at end.
 
   for (p = pat; p < pat_end; p++) {

src/nvim/version.c

@@ -69,6 +69,12 @@ static char *features[] = {
 
 // clang-format off
 static int included_patches[] = {
+  1081,
+
+
+
+
+
   1055,
   // 1054,
   // 1053,

test/functional/legacy/glob2regpat_spec.lua

@@ -0,0 +1,22 @@
+-- Tests for signs
+
+local helpers = require('test.functional.helpers')
+local clear, execute, expect = helpers.clear, helpers.execute, helpers.expect
+local eq, neq, eval = helpers.eq, helpers.neq, helpers.eval
+
+describe('glob2regpat()', function()
+  before_each(clear)
+
+  it('handles invalid input', function()
+    execute('call glob2regpat(1.33)')
+    helpers.feed('<cr>')
+    neq(nil, string.find(eval('v:errmsg'), '^E806:'))
+  end)
+  it('returns ^$ for empty input', function()
+    eq('^$', eval("glob2regpat('')"))
+  end)
+  it('handles valid input', function()
+    eq('^foo\\.', eval("glob2regpat('foo.*')"))
+    eq('\\.vim$', eval("glob2regpat('*.vim')"))
+  end)
+end)