diff mbox series

[4.9,165/271] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet()

Message ID 20200128135904.866216477@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Jan. 28, 2020, 2:05 p.m. UTC 
From: David Howells <dhowells@redhat.com>

[ Upstream commit 3427beb6375d04e9627c67343872e79341a684ea ]

With gcc 4.1:

    net/rxrpc/output.c: In function ‘rxrpc_send_data_packet’:
    net/rxrpc/output.c:338: warning: ‘ret’ may be used uninitialized in this function

Indeed, if the first jump to the send_fragmentable label is made, and
the address family is not handled in the switch() statement, ret will be
used uninitialized.

Fix this by BUG()'ing as is done in other places in rxrpc where internal
support for future address families will need adding.  It should not be
possible to reach this normally as the address families are checked
up-front.

Fixes: 5a924b8951f835b5 ("rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/rxrpc/output.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 59d3286033120..64389f493bb28 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -400,6 +400,9 @@  send_fragmentable:
 		}
 		break;
 #endif
+
+	default:
+		BUG();
 	}
 
 	up_write(&conn->params.local->defrag_sem);