linux-kernel - [PATCH 5.13 259/351] NFSD: Prevent a possible oops in the nfs

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Message-Id: <20210719144953.519491077@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:53:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chuck Lever <chuck.lever@...cle.com>,
        "J. Bruce Fields" <bfields@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 259/351] NFSD: Prevent a possible oops in the nfs_dirent() tracepoint

From: Chuck Lever <chuck.lever@...cle.com>

[ Upstream commit 7b08cf62b1239a4322427d677ea9363f0ab677c6 ]

The double copy of the string is a mistake, plus __assign_str()
uses strlen(), which is wrong to do on a string that isn't
guaranteed to be NUL-terminated.

Fixes: 6019ce0742ca ("NFSD: Add a tracepoint to record directory entry encoding")
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/trace.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index e7a269291a73..f3961506fe16 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -408,7 +408,6 @@ TRACE_EVENT(nfsd_dirent,
 		__entry->ino = ino;
 		__entry->len = namlen;
 		memcpy(__get_str(name), name, namlen);
-		__assign_str(name, name);
 	),
 	TP_printk("fh_hash=0x%08x ino=%llu name=%.*s",
 		__entry->fh_hash, __entry->ino,
-- 
2.30.2