File 0001-Follow-up-to-arithmetic-overflow-fix.patch of Package p11-kit.20937

From 7f032183dfd36c1f91d2400ceb5bbc90376a310c Mon Sep 17 00:00:00 2001
From: David Cook <divergentdave@gmail.com>
Date: Sat, 14 Nov 2020 13:10:29 -0600
Subject: [PATCH] Follow-up to arithmetic overflow fix

Check if nmemb is zero in p11_rpc_message_alloc_extra_array to avoid a
division by zero trap. Additionally, change the reallocarray
compatibility shim so that it won't assert when resizing an array to
zero, and add the same nmemb != 0 check there.
---
 common/compat.c       | 4 ++--
 p11-kit/rpc-message.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/common/compat.c b/common/compat.c
index be7e9e6..4390cef 100644
--- a/common/compat.c
+++ b/common/compat.c
@@ -525,8 +525,8 @@ reallocarray (void *ptr,
 	      size_t nmemb,
 	      size_t size)
 {
-	assert (nmemb > 0 && size > 0);
-	if (SIZE_MAX / nmemb < size) {
+	assert (nmemb >= 0 && size >= 0);
+	if (nmemb != 0 && SIZE_MAX / nmemb < size) {
 		errno = ENOMEM;
 		return NULL;
 	}
diff --git a/p11-kit/rpc-message.c b/p11-kit/rpc-message.c
index 875adaf..8dfa30b 100644
--- a/p11-kit/rpc-message.c
+++ b/p11-kit/rpc-message.c
@@ -120,7 +120,7 @@ p11_rpc_message_alloc_extra_array (p11_rpc_message *msg,
 				   size_t nmemb,
 				   size_t size)
 {
-	if ((SIZE_MAX - sizeof (void *)) / nmemb < size) {
+	if (nmemb != 0 && (SIZE_MAX - sizeof (void *)) / nmemb < size) {
 		errno = ENOMEM;
 		return NULL;
 	}
-- 
2.26.2