From: Enzo Matsumiya <ematsumiya@suse.de>
Date: Mon, 13 Apr 2026 19:07:07 +0000 (-0300)
Subject: smb: client: compress: fix bad encoding on last LZ77 flag
X-Git-Tag: v7.1-rc1~35^2~16
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=a13e942a03feea211c67a97bc6a57f82aa56e4b6;p=thirdparty%2Flinux.git

smb: client: compress: fix bad encoding on last LZ77 flag

End-of-stream flag could lead to UB because of int promotion
(overwriting signed bit).

Fix it by changing operand from '1' to '1UL'.

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/smb/client/compress/lz77.c b/fs/smb/client/compress/lz77.c
index 96e8a8057a772..cdd6b53766b0a 100644
--- a/fs/smb/client/compress/lz77.c
+++ b/fs/smb/client/compress/lz77.c
@@ -221,7 +221,7 @@ noinline int lz77_compress(const void *src, u32 slen, void *dst, u32 *dlen)
 	}
 
 	flag <<= (32 - flag_count);
-	flag |= (1 << (32 - flag_count)) - 1;
+	flag |= (1UL << (32 - flag_count)) - 1;
 	lz77_write32(flag_pos, flag);
 
 	*dlen = dstp - dst;