New patch to review for coreboot: intelvbttool: cope with errors in open()

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15962

-gerrit

commit 311cf28bc9cda89aaf6e33956caae676006e74e9
Author: Patrick Georgi 
Date:   Fri Jul 29 18:28:42 2016 +0200

intelvbttool: cope with errors in open()

Change-Id: I9fee87b7331ee05d4e984cb024f124abb2c97a69
    Signed-off-by: Patrick Georgi 
    Found-by: Coverity Scan #1347357
---
 util/intelvbttool/intelvbttool.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/util/intelvbttool/intelvbttool.c b/util/intelvbttool/intelvbttool.c
index 31fc24a..f0216dd 100644
--- a/util/intelvbttool/intelvbttool.c
+++ b/util/intelvbttool/intelvbttool.c
@@ -515,13 +515,20 @@ int main(int argc, char **argv)
 {
    const void *ptr;
    int fd;
+	off_t offset;
    if (argc == 2) {
    	fd = open(argv[1], O_RDONLY);
-		ptr = mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0);
+		offset = 0;
    } else {
    	fd = open("/dev/mem", O_RDONLY);
-		ptr = mmap(0, 65536, PROT_READ, MAP_SHARED, fd, 0xc0000);
+		offset = 0xc0000;
    }
+	if (fd < 0) {
+		fprintf(stderr, "open failed: %s\n", strerror(errno));
+		return 1;
+	}
+
+	ptr = mmap(0, 65536, PROT_READ, MAP_SHARED, fd, offset);
    if (ptr == MAP_FAILED) {
    	fprintf(stderr, "mmap failed: %s\n", strerror(errno));
    	return 1;