util_lock.c: sss_br_lock_file accepted invalid parameter value

Return EINVAL if number of tries is <= 0. Also the parameter
retries was renamed to num_tries, so it is more obvious that
it also includes the first try.

2 files changed, 7 insertions, 3 deletions

diff --git a/src/util/util.h b/src/util/util.h
index 3cea997fb..f1524f3c5 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -556,7 +556,7 @@ struct sss_domain_info *copy_subdomain(TALLOC_CTX *mem_ctx,
 
 /* from util_lock.c */
 errno_t sss_br_lock_file(int fd, size_t start, size_t len,
-                         int retries, useconds_t wait);
+                         int num_tries, useconds_t wait);
 
 /* Endianness-compatibility for systems running older versions of glibc */
 
diff --git a/src/util/util_lock.c b/src/util/util_lock.c
index c2d7fac77..8db35a8cf 100644
--- a/src/util/util_lock.c
+++ b/src/util/util_lock.c
@@ -29,19 +29,23 @@
 #include "util/util.h"
 
 errno_t sss_br_lock_file(int fd, size_t start, size_t len,
-                         int retries, useconds_t wait)
+                         int num_tries, useconds_t wait)
 {
     int ret;
     struct flock lock;
     int retries_left;
 
+    if (num_tries <= 0) {
+        return EINVAL;
+    }
+
     lock.l_type = F_WRLCK;
     lock.l_whence = SEEK_SET;
     lock.l_start = start;
     lock.l_len = len;
     lock.l_pid = 0;
 
-    for (retries_left = retries; retries_left > 0; retries_left--) {
+    for (retries_left = num_tries; retries_left > 0; retries_left--) {
         ret = fcntl(fd, F_SETLK, &lock);
         if (ret == -1) {
             ret = errno;