There is a race between a system call processing thread
and the demultiplex thread when mid->resp_buf becomes NULL
and later is being accessed to get credits. It happens when
the 1st thread wakes up before a mid callback is called in
the 2nd one but the mid state has already been set to
MID_RESPONSE_RECEIVED. This causes NULL pointer dereference
in mid callback.
Fix this by saving credits from the response before we
update the mid state and then use this value in the mid
callback rather then accessing a response buffer.
Cc: Stable <stable@xxxxxxxxxxxxxxx>
Fixes: ee258d79159afed5 ("CIFS: Move credit processing to mid callbacks for SMB3")
Signed-off-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx>
---
fs/cifs/cifsglob.h | 1 +
fs/cifs/connect.c | 15 +++++++++++++++
fs/cifs/smb2ops.c | 8 +-------
3 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 12b356b3799b..128364af4c37 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1510,6 +1510,7 @@ struct mid_q_entry {
struct TCP_Server_Info *server; /* server corresponding to this mid */
__u64 mid; /* multiplex id */
__u16 credits; /* number of credits consumed by this mid */
+ __u16 credits_received; /* number of credits from the response */
__u32 pid; /* process id */
__u32 sequence_number; /* for CIFS signing */
unsigned long when_alloc; /* when mid was created */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 8995c03056e3..e63d16d8048a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -897,6 +897,20 @@ dequeue_mid(struct mid_q_entry *mid, bool malformed)
spin_unlock(&GlobalMid_Lock);
}
+static unsigned int
+smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
+{
+ struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
+
+ /*
+ * SMB1 does not use credits.
+ */
+ if (server->vals->header_preamble_size)
+ return 0;
+
+ return le16_to_cpu(shdr->CreditRequest);
+}
+
static void
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
char *buf, int malformed)
@@ -904,6 +918,7 @@ handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
if (server->ops->check_trans2 &&
server->ops->check_trans2(mid, server, buf, malformed))
return;
+ mid->credits_received = smb2_get_credits_from_hdr(buf, server);
mid->resp_buf = buf;
mid->large_buf = server->large_buf;
/* Was previous buf put in mpx struct for multi-rsp? */
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 3bbb65e58dd6..5a13687bf547 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -151,13 +151,7 @@ smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
static unsigned int
smb2_get_credits(struct mid_q_entry *mid)
{
- struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
-
- if (mid->mid_state == MID_RESPONSE_RECEIVED
- || mid->mid_state == MID_RESPONSE_MALFORMED)
- return le16_to_cpu(shdr->CreditRequest);
-
- return 0;
+ return mid->credits_received;
}
static int
--
2.17.1
