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Message-Id: <20221218160142.925394-74-sashal@kernel.org>
Date: Sun, 18 Dec 2022 11:01:31 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Hawkins Jiawei <yin31149@...il.com>,
Jeff Layton <jlayton@...nel.org>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Sasha Levin <sashal@...nel.org>, anna@...nel.org,
linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 74/85] nfs: fix possible null-ptr-deref when parsing param
From: Hawkins Jiawei <yin31149@...il.com>
[ Upstream commit 5559405df652008e56eee88872126fe4c451da67 ]
According to commit "vfs: parse: deal with zero length string value",
kernel will set the param->string to null pointer in vfs_parse_fs_string()
if fs string has zero length.
Yet the problem is that, nfs_fs_context_parse_param() will dereferences the
param->string, without checking whether it is a null pointer, which may
trigger a null-ptr-deref bug.
This patch solves it by adding sanity check on param->string
in nfs_fs_context_parse_param().
Signed-off-by: Hawkins Jiawei <yin31149@...il.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/nfs/fs_context.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 09833ec102fc..9bcd53d5c7d4 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -684,6 +684,8 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
return ret;
break;
case Opt_vers:
+ if (!param->string)
+ goto out_invalid_value;
trace_nfs_mount_assign(param->key, param->string);
ret = nfs_parse_version_string(fc, param->string);
if (ret < 0)
@@ -696,6 +698,8 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
break;
case Opt_proto:
+ if (!param->string)
+ goto out_invalid_value;
trace_nfs_mount_assign(param->key, param->string);
protofamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
@@ -732,6 +736,8 @@ static int nfs_fs_context_parse_param(struct fs_context *fc,
break;
case Opt_mountproto:
+ if (!param->string)
+ goto out_invalid_value;
trace_nfs_mount_assign(param->key, param->string);
mountfamily = AF_INET;
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
--
2.35.1
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