From: Joseph Sutton <josephsutton@catalyst.net.nz>
Date: Mon, 7 Mar 2022 23:11:51 +0000 (+1300)
Subject: compression: Add bounds check for first output buffer write
X-Git-Tag: talloc-2.3.4~163
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41b88d35ce6b120a1252093ea55ef80b7685e71e;p=thirdparty%2Fsamba.git

compression: Add bounds check for first output buffer write

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
---

diff --git a/lib/compression/lzxpress.c b/lib/compression/lzxpress.c
index 65feed0aa73..647545bbac3 100644
--- a/lib/compression/lzxpress.c
+++ b/lib/compression/lzxpress.c
@@ -73,9 +73,11 @@ ssize_t lzxpress_compress(const uint8_t *uncompressed,
 	}
 
 	uncompressed_pos = 0;
+	compressed_pos = 0;
 	indic = 0;
+	CHECK_OUTPUT_BYTES(sizeof(uint32_t));
 	*(uint32_t *)compressed = 0;
-	compressed_pos = sizeof(uint32_t);
+	compressed_pos += sizeof(uint32_t);
 	indic_pos = 0;
 
 	indic_bit = 0;