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Message-ID:
<168451609436.45209.15407022385441542980.stgit@oracle-102.nfsv4bat.org>
Date: Fri, 19 May 2023 13:08:24 -0400
From: Chuck Lever <cel@...nel.org>
To: dan.carpenter@...aro.org
Cc: Chuck Lever <chuck.lever@...cle.com>, netdev@...r.kernel.org,
kernel-tls-handshake@...ts.linux.dev
Subject: [PATCH] net/handshake: Fix sock->file allocation
From: Chuck Lever <chuck.lever@...cle.com>
sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
^^^^ ^^^^
sock_alloc_file() calls release_sock() on error but the left hand
side of the assignment dereferences "sock". This isn't the bug and
I didn't report this earlier because there is an assert that it
doesn't fail.
net/handshake/handshake-test.c:221 handshake_req_submit_test4() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:233 handshake_req_submit_test4() warn: 'req' was already freed.
net/handshake/handshake-test.c:254 handshake_req_submit_test5() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:290 handshake_req_submit_test6() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:321 handshake_req_cancel_test1() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:355 handshake_req_cancel_test2() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:367 handshake_req_cancel_test2() warn: 'req' was already freed.
net/handshake/handshake-test.c:395 handshake_req_cancel_test3() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:407 handshake_req_cancel_test3() warn: 'req' was already freed.
net/handshake/handshake-test.c:451 handshake_req_destroy_test1() error: dereferencing freed memory 'sock'
net/handshake/handshake-test.c:463 handshake_req_destroy_test1() warn: 'req' was already freed.
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
net/handshake/handshake-test.c | 42 +++++++++++++++++++++++++++-------------
1 file changed, 28 insertions(+), 14 deletions(-)
diff --git a/net/handshake/handshake-test.c b/net/handshake/handshake-test.c
index e6adc5dec11a..daa1779063ed 100644
--- a/net/handshake/handshake-test.c
+++ b/net/handshake/handshake-test.c
@@ -209,6 +209,7 @@ static void handshake_req_submit_test4(struct kunit *test)
{
struct handshake_req *req, *result;
struct socket *sock;
+ struct file *filp;
int err;
/* Arrange */
@@ -218,9 +219,10 @@ static void handshake_req_submit_test4(struct kunit *test)
err = __sock_create(&init_net, PF_INET, SOCK_STREAM, IPPROTO_TCP,
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
KUNIT_ASSERT_NOT_NULL(test, sock->sk);
+ sock->file = filp;
err = handshake_req_submit(sock, req, GFP_KERNEL);
KUNIT_ASSERT_EQ(test, err, 0);
@@ -241,6 +243,7 @@ static void handshake_req_submit_test5(struct kunit *test)
struct handshake_req *req;
struct handshake_net *hn;
struct socket *sock;
+ struct file *filp;
struct net *net;
int saved, err;
@@ -251,9 +254,10 @@ static void handshake_req_submit_test5(struct kunit *test)
err = __sock_create(&init_net, PF_INET, SOCK_STREAM, IPPROTO_TCP,
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
KUNIT_ASSERT_NOT_NULL(test, sock->sk);
+ sock->file = filp;
net = sock_net(sock->sk);
hn = handshake_pernet(net);
@@ -276,6 +280,7 @@ static void handshake_req_submit_test6(struct kunit *test)
{
struct handshake_req *req1, *req2;
struct socket *sock;
+ struct file *filp;
int err;
/* Arrange */
@@ -287,9 +292,10 @@ static void handshake_req_submit_test6(struct kunit *test)
err = __sock_create(&init_net, PF_INET, SOCK_STREAM, IPPROTO_TCP,
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
KUNIT_ASSERT_NOT_NULL(test, sock->sk);
+ sock->file = filp;
/* Act */
err = handshake_req_submit(sock, req1, GFP_KERNEL);
@@ -307,6 +313,7 @@ static void handshake_req_cancel_test1(struct kunit *test)
{
struct handshake_req *req;
struct socket *sock;
+ struct file *filp;
bool result;
int err;
@@ -318,8 +325,9 @@ static void handshake_req_cancel_test1(struct kunit *test)
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
+ sock->file = filp;
err = handshake_req_submit(sock, req, GFP_KERNEL);
KUNIT_ASSERT_EQ(test, err, 0);
@@ -340,6 +348,7 @@ static void handshake_req_cancel_test2(struct kunit *test)
struct handshake_req *req, *next;
struct handshake_net *hn;
struct socket *sock;
+ struct file *filp;
struct net *net;
bool result;
int err;
@@ -352,8 +361,9 @@ static void handshake_req_cancel_test2(struct kunit *test)
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
+ sock->file = filp;
err = handshake_req_submit(sock, req, GFP_KERNEL);
KUNIT_ASSERT_EQ(test, err, 0);
@@ -380,6 +390,7 @@ static void handshake_req_cancel_test3(struct kunit *test)
struct handshake_req *req, *next;
struct handshake_net *hn;
struct socket *sock;
+ struct file *filp;
struct net *net;
bool result;
int err;
@@ -392,8 +403,9 @@ static void handshake_req_cancel_test3(struct kunit *test)
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
+ sock->file = filp;
err = handshake_req_submit(sock, req, GFP_KERNEL);
KUNIT_ASSERT_EQ(test, err, 0);
@@ -436,6 +448,7 @@ static void handshake_req_destroy_test1(struct kunit *test)
{
struct handshake_req *req;
struct socket *sock;
+ struct file *filp;
int err;
/* Arrange */
@@ -448,8 +461,9 @@ static void handshake_req_destroy_test1(struct kunit *test)
&sock, 1);
KUNIT_ASSERT_EQ(test, err, 0);
- sock->file = sock_alloc_file(sock, O_NONBLOCK, NULL);
- KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sock->file);
+ filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filp);
+ sock->file = filp;
err = handshake_req_submit(sock, req, GFP_KERNEL);
KUNIT_ASSERT_EQ(test, err, 0);
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