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selftests: watchdog: Validate optional file argument

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The newly added optional file argument does not validate if the
file is indeed a watchdog, e.g.:

./watchdog-test  -f /dev/zero
Watchdog Ticking Away!

Fix it by confirming that the WDIOC_GETSUPPORT ioctl succeeds.

Fixes: a4864a33f5 ("selftests: watchdog: Add optional file argument")
Reported-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
George G. Davis 2019-09-17 20:40:22 +02:00 committed by Shuah Khan
parent 852c8cbf34
commit 8f9577eda5
1 changed files with 11 additions and 0 deletions
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11
tools/testing/selftests/watchdog/watchdog-test.c
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@ -97,6 +97,7 @@ int main(int argc, char *argv[])
int c;
int oneshot = 0;
char *file = "/dev/watchdog";
struct watchdog_info info;
setbuf(stdout, NULL);
@ -118,6 +119,16 @@ int main(int argc, char *argv[])
exit(-1);
}
/*
* Validate that `file` is a watchdog device
*/
ret = ioctl(fd, WDIOC_GETSUPPORT, &info);
if (ret) {
printf("WDIOC_GETSUPPORT error '%s'\n", strerror(errno));
close(fd);
exit(ret);
}
optind = 0;
while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {