flashrom: Check return value of fscanf()/fwrite()/fread()

[coreboot.git] / util / flashrom / flashrom.c

diff --git a/util/flashrom/flashrom.c b/util/flashrom/flashrom.c
index 623ce7f05db7d005eead1a95c252054e54ea2839..9c8db6e6bd90ece7c3be6cc8075fdd9b1ebd37b2 100644 (file)
--- a/util/flashrom/flashrom.c
+++ b/util/flashrom/flashrom.c
@@ -296,7 +296,7 @@ void print_version(void)
 int main(int argc, char *argv[])
 {
        uint8_t *buf;
-       unsigned long size;
+       unsigned long size, numbytes;
        uint32_t erasedbytes;
        FILE *image;
        /* Probe for up to three flash chips. */
@@ -517,11 +517,11 @@ int main(int argc, char *argv[])
                                       exclude_end_position -
                                       exclude_start_position);
 
-                       fwrite(buf, sizeof(char), size, image);
+                       numbytes = fwrite(buf, 1, size, image);
                        fclose(image);
-                       printf("done.\n");
+                       printf("%s.\n", numbytes == size ? "done" : "FAILED");
                        free(buf);
-                       exit(0);
+                       return numbytes != size;
                }
                // FIXME: flash writes stay enabled!
                exit(1);
@@ -615,9 +615,11 @@ int main(int argc, char *argv[])
                        memset(buf + exclude_start_position, 0,
                               exclude_end_position - exclude_start_position);
 
-               fwrite(buf, sizeof(char), size, image);
+               numbytes = fwrite(buf, 1, size, image);
                fclose(image);
-               printf("done.\n");
+               printf("%s.\n", numbytes == size ? "done" : "FAILED");
+               if (numbytes != size)
+                       return 1;
        } else {
                struct stat image_stat;
 
@@ -634,9 +636,13 @@ int main(int argc, char *argv[])
                        exit(1);
                }
 
-               fread(buf, sizeof(char), size, image);
+               numbytes = fread(buf, 1, size, image);
                show_id(buf, size, force);
                fclose(image);
+               if (numbytes != size) {
+                       fprintf(stderr, "Error: Failed to read file. Got %ld bytes, wanted %ld!\n", numbytes, size);
+                       return 1;
+               }
        }
 
        /* exclude range stuff. Nice idea, but at the moment it is only