From: Mark Adler <zlib@madler.net>
Date: Fri, 13 Oct 2017 02:34:51 +0000 (-0700)
Subject: Avoid undefined behaviors of memcpy() in gz*printf().
X-Git-Tag: v1.2.12~45
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=b25d5fcdcf4723ca3da8bc69ecc6c52010778f7c;p=zlib.git

Avoid undefined behaviors of memcpy() in gz*printf().
---

diff --git a/gzwrite.c b/gzwrite.c
index 3560193..26e89b6 100644
--- a/gzwrite.c
+++ b/gzwrite.c
@@ -444,7 +444,7 @@ int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
         strm->avail_in = state->size;
         if (gz_comp(state, Z_NO_FLUSH) == -1)
             return state->err;
-        memcpy(state->in, state->in + state->size, left);
+        memmove(state->in, state->in + state->size, left);
         strm->next_in = state->in;
         strm->avail_in = left;
     }
@@ -543,7 +543,7 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
         strm->avail_in = state->size;
         if (gz_comp(state, Z_NO_FLUSH) == -1)
             return state->err;
-        memcpy(state->in, state->in + state->size, left);
+        memmove(state->in, state->in + state->size, left);
         strm->next_in = state->in;
         strm->avail_in = left;
     }