From: Alistair Francis <alistair.francis@wdc.com>
To: libc-alpha@sourceware.org
Cc: law@redhat.com, joseph@codesourcery.com, zackw@panix.com,
alistair.francis@wdc.com, macro@wdc.com, alistair23@gmail.com
Subject: [PATCH] inet/net-internal.h: Fix uninitalised clntudp_call() variable
Date: Mon, 16 Sep 2019 15:15:36 -0700 [thread overview]
Message-ID: <20190916221536.18500-1-alistair.francis@wdc.com> (raw)
The total_deadline variable inside the clntudp_call() function inside
sunrpc/clnt_udp.c can cause uninitalised variable warnings when building
with GCC 8.3 or 9.2 on a platform with a 64-bit tv_nsec on a 32-bit
architecture. To fix the warning let's use the DIAG_* macros to hide the
warning.
A GCC bug case has also been submitted:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91691
2019-09-16 Alistair Francis <alistair.francis@wdc.com>
* inet/net-internal.h: Fix uninitalised clntudp_call() variable
---
inet/net-internal.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/inet/net-internal.h b/inet/net-internal.h
index 2f522eef555..c774de2b78a 100644
--- a/inet/net-internal.h
+++ b/inet/net-internal.h
@@ -23,6 +23,7 @@
#include <stdbool.h>
#include <stdint.h>
#include <sys/time.h>
+#include <libc-diag.h>
int __inet6_scopeid_pton (const struct in6_addr *address,
const char *scope, uint32_t *result);
@@ -96,6 +97,16 @@ __deadline_is_infinite (struct deadline deadline)
return deadline.absolute.tv_nsec < 0;
}
+/* GCC 8.3 and 9.2 both incorrectly report total_deadline
+ * (from sunrpc/clnt_udp.c) as maybe-uninitialized when tv_sec is 8 bytes
+ * (64-bits) wide on 32-bit systems. We have to set -Wmaybe-uninitialized
+ * here as it won't fix the error in sunrpc/clnt_udp.c.
+ * A GCC bug has been filed here:
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91691
+ */
+DIAG_PUSH_NEEDS_COMMENT;
+DIAG_IGNORE_NEEDS_COMMENT (9, "-Wmaybe-uninitialized");
+
/* Return true if the current time is at the deadline or past it. */
static inline bool
__deadline_elapsed (struct deadline_current_time current,
@@ -120,6 +131,8 @@ __deadline_first (struct deadline left, struct deadline right)
return right;
}
+DIAG_POP_NEEDS_COMMENT;
+
/* Add TV to the current time and return it. Returns a special
infinite absolute deadline on overflow. */
struct deadline __deadline_from_timeval (struct deadline_current_time,
--
2.23.0
next reply other threads:[~2019-09-16 22:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 22:15 Alistair Francis [this message]
2019-09-24 17:04 ` [PATCH] inet/net-internal.h: Fix uninitalised clntudp_call() variable Alistair Francis
2019-09-24 20:21 ` Carlos O'Donell
2019-09-24 20:30 ` Alistair Francis
2019-09-24 21:00 ` Maciej W. Rozycki
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