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Avoid an undefined behavior of memcpy() in _tr_stored_block().

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Allegedly the behavior of memcpy() is undefined if the source
pointer is NULL, even if the number of bytes to copy is zero.
This commit is contained in:
Mark Adler 2017-10-12 19:44:01 -07:00
parent b25d5fcdcf
commit 723e928b84
1 changed files with 2 additions and 1 deletions
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3
trees.c
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@ -870,7 +870,8 @@ void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
bi_windup(s); /* align on byte boundary */
put_short(s, (ush)stored_len);
put_short(s, (ush)~stored_len);
zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
if (stored_len)
zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
s->pending += stored_len;
#ifdef ZLIB_DEBUG
s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;