linux-kernel - Re: [syzbot] [erofs?] KMSAN: uninit-value in z_erofs_lz4

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Message-ID: <000000000000ed2009060d879851@google.com>
Date: Wed, 27 Dec 2023 17:11:37 -0800
From: syzbot <syzbot+6c746eea496f34b3161d@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [erofs?] KMSAN: uninit-value in z_erofs_lz4_decompress (2)

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Subject: [erofs?] KMSAN: uninit-value in z_erofs_lz4_decompress (2)
Author: lizhi.xu@...driver.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fbafc3e621c3

diff --git a/lib/hexdump.c b/lib/hexdump.c
index 06833d404398..68b30bf6c6a3 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -263,12 +263,14 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
 		    const void *buf, size_t len, bool ascii)
 {
 	const u8 *ptr = buf;
-	int i, linelen, remaining = len;
+	int i, linelen, remaining;
 	unsigned char linebuf[32 * 3 + 2 + 32 + 1];
 
 	if (rowsize != 16 && rowsize != 32)
 		rowsize = 16;
 
+	len = len > sizeof(linebuf) ? sizeof(linebuf) : len;
+	remaining = len;
 	for (i = 0; i < len; i += rowsize) {
 		linelen = min(remaining, rowsize);
 		remaining -= rowsize;