mkeficapsule: Miscellaneous fixes in the utility

Miscellaneous fixes in the mkeficapsule utility -- these include a few
resource leak issues flagged by Coverity along with some additional
code improvements suggested by Heinrich during code review.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>

diff --git a/tools/mkeficapsule.c b/tools/mkeficapsule.c
index 36f693f..1624949 100644 (file)
--- a/tools/mkeficapsule.c
+++ b/tools/mkeficapsule.c
@@ -137,8 +137,8 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
                          bool overlay)
 {
        int ret;
-       int srcfd = 0;
-       int destfd = 0;
+       int srcfd = -1;
+       int destfd = -1;
        void *sptr = NULL;
        void *dptr = NULL;
        off_t src_size;
@@ -150,6 +150,7 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (srcfd == -1) {
                fprintf(stderr, "%s: Can't open %s: %s\n",
                        __func__, pkey_file, strerror(errno));
+               ret = -1;
                goto err;
        }
 
@@ -157,6 +158,7 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (ret == -1) {
                fprintf(stderr, "%s: Can't stat %s: %s\n",
                        __func__, pkey_file, strerror(errno));
+               ret = -1;
                goto err;
        }
 
@@ -164,9 +166,10 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
 
        /* mmap the public key esl file */
        sptr = mmap(0, src_size, PROT_READ, MAP_SHARED, srcfd, 0);
-       if ((sptr == MAP_FAILED) || (errno != 0)) {
+       if (sptr == MAP_FAILED) {
                fprintf(stderr, "%s: Failed to mmap %s:%s\n",
                        __func__, pkey_file, strerror(errno));
+               ret = -1;
                goto err;
        }
 
@@ -175,6 +178,7 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (destfd == -1) {
                fprintf(stderr, "%s: Can't open %s: %s\n",
                        __func__, dtb_file, strerror(errno));
+               ret = -1;
                goto err;
        }
 
@@ -189,21 +193,24 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (ftruncate(destfd, dtb.st_size)) {
                fprintf(stderr, "%s: Can't expand %s: %s\n",
                        __func__, dtb_file, strerror(errno));
-               goto err;;
+               ret = -1;
+               goto err;
        }
 
        errno = 0;
        /* mmap the dtb file */
        dptr = mmap(0, dtb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
                    destfd, 0);
-       if ((dptr == MAP_FAILED) || (errno != 0)) {
+       if (dptr == MAP_FAILED) {
                fprintf(stderr, "%s: Failed to mmap %s:%s\n",
                        __func__, dtb_file, strerror(errno));
+               ret = -1;
                goto err;
        }
 
        if (fdt_check_header(dptr)) {
                fprintf(stderr, "%s: Invalid FDT header\n", __func__);
+               ret = -1;
                goto err;
        }
 
@@ -211,6 +218,7 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (ret) {
                fprintf(stderr, "%s: Cannot expand FDT: %s\n",
                        __func__, fdt_strerror(ret));
+               ret = -1;
                goto err;
        }
 
@@ -219,10 +227,11 @@ static int add_public_key(const char *pkey_file, const char *dtb_file,
        if (ret < 0) {
                fprintf(stderr, "%s: Unable to add public key to the FDT\n",
                        __func__);
+               ret = -1;
                goto err;
        }
 
-       return 0;
+       ret = 0;
 
 err:
        if (sptr)
@@ -231,13 +240,13 @@ err:
        if (dptr)
                munmap(dptr, dtb.st_size);
 
-       if (srcfd >= 0)
+       if (srcfd != -1)
                close(srcfd);
 
-       if (destfd >= 0)
+       if (destfd != -1)
                close(destfd);
 
-       return -1;
+       return ret;
 }
 
 static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
@@ -424,26 +433,25 @@ int main(int argc, char **argv)
 
        /* need a fit image file or raw image file */
        if (!file && !pkey_file && !dtb_file) {
-               printf("%s: %d\n", __func__, __LINE__);
                print_usage();
-               return -1;
+               exit(EXIT_FAILURE);
        }
 
        if (pkey_file && dtb_file) {
                ret = add_public_key(pkey_file, dtb_file, overlay);
                if (ret == -1) {
                        printf("Adding public key to the dtb failed\n");
-                       return -1;
+                       exit(EXIT_FAILURE);
                } else {
-                       return 0;
+                       exit(EXIT_SUCCESS);
                }
        }
 
        if (create_fwbin(argv[optind], file, guid, index, instance)
                        < 0) {
                printf("Creating firmware capsule failed\n");
-               return -1;
+               exit(EXIT_FAILURE);
        }
 
-       return 0;
+       exit(EXIT_SUCCESS);
 }