linux-kernel - [PATCH] tty: n_gsm: return -EINVAL when adaption is not supported

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Date:   Tue, 26 Apr 2022 08:05:54 -0400
From:   Tom Rix <trix@...hat.com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        nathan@...nel.org, ndesaulniers@...gle.com
Cc:     linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] tty: n_gsm: return -EINVAL when adaption is not supported

The clang build fails with
n_gsm.c:940:13: error: variable 'size' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        } else if (dlci->adaption == 2) {
                   ^~~~~~~~~~~~~~~~~~~

The else should return an error, so return -EINVAL.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/tty/n_gsm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index b0762d2fa8d6..3b8c65f66d64 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -944,6 +944,7 @@ static int gsm_dlci_modem_output(struct gsm_mux *gsm, struct gsm_dlci *dlci,
 	} else {
 		pr_err("%s: unsupported adaption %d\n", __func__,
 		       dlci->adaption);
+		return -EINVAL;
 	}
 
 	msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
-- 
2.27.0