linux-kernel - Re: [syzbot] [exfat?] kernel BUG in iov_iter

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Message-ID: <tencent_1B2ECE8078726E5C2D856C0497A0E80EED0A@qq.com>
Date: Fri, 19 Jan 2024 13:51:37 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+fd404f6b03a58e8bc403@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [exfat?] kernel BUG in iov_iter_revert

please test kernel BUG in iov_iter_revert

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 052d534373b7

diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 522edcbb2ce4..af8870145f67 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -534,7 +534,8 @@ static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 		size = pos + ret;
 
 	/* zero the unwritten part in the partially written block */
-	if (rw == READ && pos < ei->valid_size && ei->valid_size < size) {
+	if (ret == -EIOCBQUEUED && rw == READ && pos < ei->valid_size && 
+			ei->valid_size < size) {
 		iov_iter_revert(iter, size - ei->valid_size);
 		iov_iter_zero(size - ei->valid_size, iter);
 	}