[PATCH 5.16 124/227] net/smc: Avoid overwriting the copies of clcsock callback functions

[Greg Kroah-Hartman]

From: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>

commit 1de9770d121ee9294794cca0e0be8fbfa0134ee8 upstream.

The callback functions of clcsock will be saved and replaced during
the fallback. But if the fallback happens more than once, then the
copies of these callback functions will be overwritten incorrectly,
resulting in a loop call issue:

clcsk->sk_error_report
 |- smc_fback_error_report() <------------------------------|
     |- smc_fback_forward_wakeup()                          | (loop)
         |- clcsock_callback()  (incorrectly overwritten)   |
             |- smc->clcsk_error_report() ------------------|

So this patch fixes the issue by saving these function pointers only
once in the fallback and avoiding overwriting.

Reported-by: syzbot+4de3c0e8a263e1e499bc@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 341adeec9ada ("net/smc: Forward wakeup to smc socket waitqueue after fallback")
Link: https://lore.kernel.org/r/0000000000006d045e05d78776f6@xxxxxxxxxx
Signed-off-by: Wen Gu <guwen@xxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/smc/af_smc.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -667,14 +667,17 @@ static void smc_fback_error_report(struc
 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
 {
 	struct sock *clcsk;
+	int rc = 0;
 
 	mutex_lock(&smc->clcsock_release_lock);
 	if (!smc->clcsock) {
-		mutex_unlock(&smc->clcsock_release_lock);
-		return -EBADF;
+		rc = -EBADF;
+		goto out;
 	}
 	clcsk = smc->clcsock->sk;
 
+	if (smc->use_fallback)
+		goto out;
 	smc->use_fallback = true;
 	smc->fallback_rsn = reason_code;
 	smc_stat_fallback(smc);
@@ -702,8 +705,9 @@ static int smc_switch_to_fallback(struct
 		smc->clcsock->sk->sk_user_data =
 			(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
 	}
+out:
 	mutex_unlock(&smc->clcsock_release_lock);
-	return 0;
+	return rc;
 }
 
 /* fall back during connect */