From 7c763f67a67e5deb43c538311e2b3119b7e79c89 Mon Sep 17 00:00:00 2001
From: makejian <makejian@xiaomi.com>
Date: Tue, 19 Dec 2023 21:21:38 +0800
Subject: [PATCH] crypto/poly1305: Fix false positive '-Wstringop-overflow'
 warning in poly1305.c

poly1305.c:241:40: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
  241 |           st->buffer[st->leftover + i] = m[i];
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
Signed-off-by: makejian <makejian@xiaomi.com>
---
 crypto/poly1305.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crypto/poly1305.c b/crypto/poly1305.c
index fa0b810879..94c206b695 100644
--- a/crypto/poly1305.c
+++ b/crypto/poly1305.c
@@ -236,9 +236,9 @@ void poly1305_update(FAR poly1305_state *st,
 
   if (bytes)
     {
-      for (i = 0; i < bytes; i++)
+      for (i = 0; i < bytes && i < poly1305_block_size; i++)
         {
-          st->buffer[st->leftover + i] = m[i];
+          st->buffer[i] = m[i];
         }
 
       st->leftover += bytes;