Improve error handling in fit_common

Make the error handling common, and make sure the file is always closed
on error. Rename the parameter to be more description and add comments.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/fit_check_sign.c

@@ -62,10 +62,10 @@ int main(int argc, char **argv)
 			break;
 	}
 
-	ffd = mmap_fdt(cmdname, fdtfile, &fit_blob, &fsbuf, 0);
+	ffd = mmap_fdt(cmdname, fdtfile, &fit_blob, &fsbuf, false);
 	if (ffd < 0)
 		return EXIT_FAILURE;
-	kfd = mmap_fdt(cmdname, keyfile, &key_blob, &ksbuf, 0);
+	kfd = mmap_fdt(cmdname, keyfile, &key_blob, &ksbuf, false);
 	if (ffd < 0)
 		return EXIT_FAILURE;
 

tools/fit_common.c

@@ -38,8 +38,8 @@ int fit_check_image_types(uint8_t type)
 		return EXIT_FAILURE;
 }
 
-int mmap_fdt(char *cmdname, const char *fname, void **blobp,
-		struct stat *sbuf, int useunlink)
+int mmap_fdt(const char *cmdname, const char *fname, void **blobp,
+	     struct stat *sbuf, bool delete_on_error)
 {
 	void *ptr;
 	int fd;
@@ -50,17 +50,13 @@ int mmap_fdt(char *cmdname, const char *fname, void **blobp,
 	if (fd < 0) {
 		fprintf(stderr, "%s: Can't open %s: %s\n",
 			cmdname, fname, strerror(errno));
-		if (useunlink)
-			unlink(fname);
-		return -1;
+		goto err;
 	}
 
 	if (fstat(fd, sbuf) < 0) {
 		fprintf(stderr, "%s: Can't stat %s: %s\n",
 			cmdname, fname, strerror(errno));
-		if (useunlink)
-			unlink(fname);
-		return -1;
+		goto err;
 	}
 
 	errno = 0;
@@ -68,19 +64,23 @@ int mmap_fdt(char *cmdname, const char *fname, void **blobp,
 	if ((ptr == MAP_FAILED) || (errno != 0)) {
 		fprintf(stderr, "%s: Can't read %s: %s\n",
 			cmdname, fname, strerror(errno));
-		if (useunlink)
-			unlink(fname);
-		return -1;
+		goto err;
 	}
 
 	/* check if ptr has a valid blob */
 	if (fdt_check_header(ptr)) {
 		fprintf(stderr, "%s: Invalid FIT blob\n", cmdname);
-		if (useunlink)
-			unlink(fname);
-		return -1;
+		goto err;
 	}
 
 	*blobp = ptr;
 	return fd;
+
+err:
+	if (fd >= 0)
+		close(fd);
+	if (delete_on_error)
+		unlink(fname);
+
+	return -1;
 }

tools/fit_common.h

@@ -16,7 +16,17 @@ int fit_verify_header(unsigned char *ptr, int image_size,
 
 int fit_check_image_types(uint8_t type);
 
-int mmap_fdt(char *cmdname, const char *fname, void **blobp,
-		struct stat *sbuf, int useunlink);
+/**
+ * Map an FDT into memory, optionally increasing its size
+ *
+ * @cmdname:	Tool name (for displaying with error messages)
+ * @fname:	Filename containing FDT
+ * @blobp:	Returns pointer to FDT blob
+ * @sbuf:	File status information is stored here
+ * @delete_on_error:	true to delete the file if we get an error
+ * @return 0 if OK, -1 on error.
+ */
+int mmap_fdt(const char *cmdname, const char *fname, void **blobp,
+	     struct stat *sbuf, bool delete_on_error);
 
 #endif /* _FIT_COMMON_H_ */

tools/fit_info.c

@@ -68,7 +68,7 @@ int main(int argc, char **argv)
 			break;
 		}
 
-	ffd = mmap_fdt(cmdname, fdtfile, &fit_blob, &fsbuf, 0);
+	ffd = mmap_fdt(cmdname, fdtfile, &fit_blob, &fsbuf, false);
 
 	if (ffd < 0) {
 		printf("Could not open %s\n", fdtfile);