Fix: passing negative param to dup(2) on error

Reported-by: Coverity (1395195)
Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/common/userspace-probe.c b/src/common/userspace-probe.c
index 6331ff13574e9f03e14a4dc426284fe97390e526..e764d137b9f3b8c8c7b973a1a3787c84986ccc9e 100644 (file)
--- a/src/common/userspace-probe.c
+++ b/src/common/userspace-probe.c
@@ -404,7 +404,7 @@ lttng_userspace_probe_location_function_copy(
        struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL;
        const char *binary_path = NULL;
        const char *function_name = NULL;
-       int fd;
+       int fd, new_fd;
 
        assert(location);
        assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION);
@@ -423,8 +423,14 @@ lttng_userspace_probe_location_function_copy(
        }
 
        /* Duplicate the binary fd */
-       fd = dup(lttng_userspace_probe_location_function_get_binary_fd(location));
+       fd = lttng_userspace_probe_location_function_get_binary_fd(location);
        if (fd == -1) {
+               ERR("Error getting file descriptor to binary");
+               goto error;
+       }
+
+       new_fd = dup(fd);
+       if (new_fd == -1) {
                PERROR("Error duplicating file descriptor to binary");
                goto error;
        }
@@ -456,7 +462,7 @@ lttng_userspace_probe_location_function_copy(
        }
 
        /* Set the duplicated fd to the new probe_location */
-       if (lttng_userspace_probe_location_function_set_binary_fd(new_location, fd) < 0) {
+       if (lttng_userspace_probe_location_function_set_binary_fd(new_location, new_fd) < 0) {
                goto destroy_probe_location;
        }
 
@@ -467,7 +473,7 @@ destroy_probe_location:
 destroy_lookup_method:
        lttng_userspace_probe_location_lookup_method_destroy(lookup_method);
 close_fd:
-       if (close(fd) < 0) {
+       if (close(new_fd) < 0) {
                PERROR("Error closing duplicated file descriptor in error path");
        }
 error:
@@ -486,7 +492,7 @@ lttng_userspace_probe_location_tracepoint_copy(
        const char *binary_path = NULL;
        const char *probe_name = NULL;
        const char *provider_name = NULL;
-       int fd;
+       int fd, new_fd;
 
        assert(location);
        assert(location->type == LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT);
@@ -511,8 +517,14 @@ lttng_userspace_probe_location_tracepoint_copy(
        }
 
        /* Duplicate the binary fd */
-       fd = dup(lttng_userspace_probe_location_tracepoint_get_binary_fd(location));
+       fd = lttng_userspace_probe_location_tracepoint_get_binary_fd(location);
        if (fd == -1) {
+               ERR("Error getting file descriptor to binary");
+               goto error;
+       }
+
+       new_fd = dup(fd);
+       if (new_fd == -1) {
                PERROR("Error duplicating file descriptor to binary");
                goto error;
        }
@@ -544,7 +556,7 @@ lttng_userspace_probe_location_tracepoint_copy(
        }
 
        /* Set the duplicated fd to the new probe_location */
-       if (lttng_userspace_probe_location_tracepoint_set_binary_fd(new_location, fd) < 0) {
+       if (lttng_userspace_probe_location_tracepoint_set_binary_fd(new_location, new_fd) < 0) {
                goto destroy_probe_location;
        }
 
@@ -555,7 +567,7 @@ destroy_probe_location:
 destroy_lookup_method:
        lttng_userspace_probe_location_lookup_method_destroy(lookup_method);
 close_fd:
-       if (close(fd) < 0) {
+       if (close(new_fd) < 0) {
                PERROR("Error closing duplicated file descriptor in error path");
        }
 error: