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    Subject[PATCH AUTOSEL 4.19 444/671] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet()
    Date
    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(+)

    diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
    index 345dc1c5fe72..31e47cfb3e68 100644
    --- a/net/rxrpc/output.c
    +++ b/net/rxrpc/output.c
    @@ -524,6 +524,9 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
    }
    break;
    #endif
    +
    + default:
    + BUG();
    }

    if (ret < 0)
    --
    2.20.1
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