diff.c: guard config parser from value=NULL

diff.external, diff.*.command, diff.color.*, color.diff.* and
diff.*.funcname configuration variables expect a string value.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index 5b8afdcb05abd4f634b49adb2f521fc75e220647..4d2e23ae1b7dd4bd43d5c03871ce8ab519272115 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -158,6 +158,8 @@ int git_diff_ui_config(const char *var, const char *value)
                return 0;
        }
        if (!strcmp(var, "diff.external")) {
+               if (!value)
+                       return config_error_nonbool(var);
                external_diff_cmd_cfg = xstrdup(value);
                return 0;
        }
@@ -165,8 +167,11 @@ int git_diff_ui_config(const char *var, const char *value)
                const char *ep = strrchr(var, '.');
 
                if (ep != var + 4) {
-                       if (!strcmp(ep, ".command"))
+                       if (!strcmp(ep, ".command")) {
+                               if (!value)
+                                       return config_error_nonbool(var);
                                return parse_lldiff_command(var, ep, value);
+                       }
                }
        }
 
@@ -177,6 +182,8 @@ int git_diff_basic_config(const char *var, const char *value)
 {
        if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
                int slot = parse_diff_color_slot(var, 11);
+               if (!value)
+                       return config_error_nonbool(var);
                color_parse(value, var, diff_colors[slot]);
                return 0;
        }
@@ -184,8 +191,11 @@ int git_diff_basic_config(const char *var, const char *value)
        if (!prefixcmp(var, "diff.")) {
                const char *ep = strrchr(var, '.');
                if (ep != var + 4) {
-                       if (!strcmp(ep, ".funcname"))
+                       if (!strcmp(ep, ".funcname")) {
+                               if (!value)
+                                       return config_error_nonbool(var);
                                return parse_funcname_pattern(var, ep, value);
+                       }
                }
        }