linux-kernel - [PATCH rcu 1/5] tools/nolibc/stdlib: Support overflow checking for older compiler versions

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Message-Id: <20220620231328.3845126-1-paulmck@kernel.org>
Date:   Mon, 20 Jun 2022 16:13:24 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        Willy Tarreau <w@....eu>,
        Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 1/5] tools/nolibc/stdlib: Support overflow checking for older compiler versions

From: Ammar Faizi <ammarfaizi2@...weeb.org>

Previously, we used __builtin_mul_overflow() to check for overflow in
the multiplication operation in the calloc() function. However, older
compiler versions don't support this built-in. This patch changes the
overflow checking mechanism to make it work on any compiler version
by using a division method to check for overflow. No functional change
intended. While in there, remove the unused variable `void *orig`.

Link: https://lore.kernel.org/lkml/20220330024114.GA18892@1wt.eu
Suggested-by: Willy Tarreau <w@....eu>
Cc: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
Acked-by: Willy Tarreau <w@....eu>
Reviewed-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/stdlib.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index 8fd32eaf80370..92378c4b96605 100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -128,10 +128,9 @@ void *malloc(size_t len)
 static __attribute__((unused))
 void *calloc(size_t size, size_t nmemb)
 {
-	void *orig;
-	size_t res = 0;
+	size_t x = size * nmemb;
 
-	if (__builtin_expect(__builtin_mul_overflow(nmemb, size, &res), 0)) {
+	if (__builtin_expect(size && ((x / size) != nmemb), 0)) {
 		SET_ERRNO(ENOMEM);
 		return NULL;
 	}
@@ -140,7 +139,7 @@ void *calloc(size_t size, size_t nmemb)
 	 * No need to zero the heap, the MAP_ANONYMOUS in malloc()
 	 * already does it.
 	 */
-	return malloc(res);
+	return malloc(x);
 }
 
 static __attribute__((unused))
-- 
2.31.1.189.g2e36527f23