From ffbab4fbf218514845b8e5209aec044621b1f460 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@rspamd.com>
Date: Sun, 6 Aug 2023 18:33:37 +0100
Subject: [PATCH] [CritFix] Fix leak in `gzip` function

Upstream-Issue: https://github.com/rspamd/rspamd/issues/4564

diff --git a/src/libutil/util.c b/src/libutil/util.c
index 4be7cc620..deba3e807 100644
--- a/src/libutil/util.c
+++ b/src/libutil/util.c
@@ -2231,6 +2231,7 @@ rspamd_fstring_gzip(rspamd_fstring_t **in)
 	strm.avail_out = sizeof(temp) > buf->allocated ? buf->allocated : sizeof(temp);
 	ret = deflate(&strm, Z_FINISH);
 	if (ret == Z_STREAM_ERROR) {
+		deflateEnd(&strm);
 		return FALSE;
 	}
 
@@ -2247,6 +2248,8 @@ rspamd_fstring_gzip(rspamd_fstring_t **in)
 		if (ret != Z_BUF_ERROR || strm.avail_in == 0) {
 			buf->len = strm.next_out - (unsigned char *) buf->str;
 			*in = buf;
+			deflateEnd(&strm);
+
 			return ret == Z_STREAM_END;
 		}
 	}
@@ -2267,6 +2270,7 @@ rspamd_fstring_gzip(rspamd_fstring_t **in)
 	g_free(hold);
 	buf->len = strm.next_out - (unsigned char *) buf->str;
 	*in = buf;
+	deflateEnd(&strm);
 
 	return ret == Z_STREAM_END;
 }