Merge branch 'jk/mv-submodules-fix' into maint

* jk/mv-submodules-fix:
  mv: prevent mismatched data when ignoring errors.
  builtin/mv: fix out of bounds write

Conflicts:
	t/t7001-mv.sh

builtin/mv.c

@@ -179,6 +179,9 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 						modes = xrealloc(modes,
 								(argc + last - first)
 								* sizeof(enum update_mode));
+						submodule_gitfile = xrealloc(submodule_gitfile,
+								(argc + last - first)
+								* sizeof(char *));
 					}
 
 					dst = add_slash(dst);
@@ -192,6 +195,7 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 							prefix_path(dst, dst_len,
 								path + length + 1);
 						modes[argc + j] = INDEX;
+						submodule_gitfile[argc + j] = NULL;
 					}
 					argc += last - first;
 				}
@@ -227,6 +231,11 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 					memmove(destination + i,
 						destination + i + 1,
 						(argc - i) * sizeof(char *));
+					memmove(modes + i, modes + i + 1,
+						(argc - i) * sizeof(enum update_mode));
+					memmove(submodule_gitfile + i,
+						submodule_gitfile + i + 1,
+						(argc - i) * sizeof(char *));
 					i--;
 				}
 			} else

t/t7001-mv.sh

@@ -294,7 +294,8 @@ test_expect_success 'setup submodule' '
 	git submodule add ./. sub &&
 	echo content >file &&
 	git add file &&
-	git commit -m "added sub and file"
+	git commit -m "added sub and file" &&
+	git branch submodule
 '
 
 test_expect_success 'git mv cannot move a submodule in a file' '
@@ -463,4 +464,14 @@ test_expect_success 'checking out a commit before submodule moved needs manual u
 	! test -s actual
 '
 
+test_expect_success 'mv -k does not accidentally destroy submodules' '
+	git checkout submodule &&
+	mkdir dummy dest &&
+	git mv -k dummy sub dest &&
+	git status --porcelain >actual &&
+	grep "^R  sub -> dest/sub" actual &&
+	git reset --hard &&
+	git checkout .
+'
+
 test_done