[PATCH 6.1 531/609] tls: dont abort the connection on signal-interrupted sends

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maximilian Immanuel Brandtner <[email protected]>

[ Upstream commit af0e5cdd031f4f4a8f6d4160bfbda4f36872b0ed ]

When a signal interrupts a blocking send, tls_tx_records() treats the
resulting -ERESTARTSYS as a transmission failure and marks the socket
errored via tls_err_abort() with the raw error code. Later syscalls
return the kernel-internal errno 512 (ERESTARTSYS) to userspace, as the
signal it stems from is no longer pending during syscall exit and thus
never translated.

An interrupted send is not a connection error: the partially sent record
stays queued and is resent later. Interrupt error codes are therefore
excluded from the abort in the same way as -EAGAIN.

Fixes: b341ca51d267 ("tls: Fix tls_sw_sendmsg error handling")
Signed-off-by: Maximilian Immanuel Brandtner <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 net/tls/tls_sw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 1b4e35dcb996b..5eec7c10acc20 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -457,7 +457,7 @@ int tls_tx_records(struct sock *sk, int flags)
 	}
 
 tx_err:
-	if (rc < 0 && rc != -EAGAIN)
+	if (rc < 0 && rc != -EAGAIN && rc != -EINTR && rc != -ERESTARTSYS)
 		tls_err_abort(sk, rc);
 
 	return rc;
-- 
2.53.0