Merge pull request libgit2#5298 from pks-t/pks/patch-whitespace-only-paths

patch_parse: fix segfault when header path contains whitespace only

Author: ethomson

src/patch_parse.c

@@ -69,27 +69,24 @@ static int parse_header_path_buf(git_buf *path, git_patch_parse_ctx *ctx, size_t
 {
 	int error;
 
-	if (!path_len)
-		return git_parse_err("patch contains empty path at line %"PRIuZ,
-				     ctx->parse_ctx.line_num);
-
 	if ((error = git_buf_put(path, ctx->parse_ctx.line, path_len)) < 0)
-		goto done;
+		return error;
 
 	git_parse_advance_chars(&ctx->parse_ctx, path_len);
 
 	git_buf_rtrim(path);
 
-	if (path->size > 0 && path->ptr[0] == '"')
-		error = git_buf_unquote(path);
-
-	if (error < 0)
-		goto done;
+	if (path->size > 0 && path->ptr[0] == '"' &&
+	    (error = git_buf_unquote(path)) < 0)
+		return error;
 
 	git_path_squash_slashes(path);
 
-done:
-	return error;
+	if (!path->size)
+		return git_parse_err("patch contains empty path at line %"PRIuZ,
+				     ctx->parse_ctx.line_num);
+
+	return 0;
 }
 
 static int parse_header_path(char **out, git_patch_parse_ctx *ctx)

tests/patch/parse.c

@@ -156,6 +156,20 @@ void test_patch_parse__binary_file_with_missing_paths(void)
 					  strlen(PATCH_BINARY_FILE_WITH_MISSING_PATHS), NULL));
 }
 
+void test_patch_parse__binary_file_with_whitespace_paths(void)
+{
+	git_patch *patch;
+	cl_git_fail(git_patch_from_buffer(&patch, PATCH_BINARY_FILE_WITH_WHITESPACE_PATHS,
+					  strlen(PATCH_BINARY_FILE_WITH_WHITESPACE_PATHS), NULL));
+}
+
+void test_patch_parse__binary_file_with_empty_quoted_paths(void)
+{
+	git_patch *patch;
+	cl_git_fail(git_patch_from_buffer(&patch, PATCH_BINARY_FILE_WITH_QUOTED_EMPTY_PATHS,
+					  strlen(PATCH_BINARY_FILE_WITH_QUOTED_EMPTY_PATHS), NULL));
+}
+
 void test_patch_parse__memory_leak_on_multiple_paths(void)
 {
 	git_patch *patch;

tests/patch/patch_common.h

@@ -912,6 +912,18 @@
 	"+++ \n" \
 	"Binary files "
 
+#define PATCH_BINARY_FILE_WITH_WHITESPACE_PATHS \
+	"diff --git a/file b/file\n" \
+	"---  \n" \
+	"+++  \n" \
+	"Binary files "
+
+#define PATCH_BINARY_FILE_WITH_QUOTED_EMPTY_PATHS \
+	"diff --git a/file b/file\n" \
+	"--- \"\"\n" \
+	"+++ \"\"\n" \
+	"Binary files "
+
 #define PATCH_MULTIPLE_OLD_PATHS \
 	"diff --git  \n" \
 	"---  \n" \