linux-kernel - [PATCH 5.15 092/106] tty: n_gsm: Debug output allocation must use GFP

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Date:   Mon, 20 Jun 2022 14:51:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, stable <stable@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Tony Lindgren <tony@...mide.com>
Subject: [PATCH 5.15 092/106] tty: n_gsm: Debug output allocation must use GFP_ATOMIC

From: Tony Lindgren <tony@...mide.com>

commit e74024b2eccbb784824a0f9feaeaaa3b47514b79 upstream.

Dan Carpenter <dan.carpenter@...cle.com> reported the following Smatch
warning:

drivers/tty/n_gsm.c:720 gsm_data_kick()
warn: sleeping in atomic context

This is because gsm_control_message() is holding a spin lock so
gsm_hex_dump_bytes() needs to use GFP_ATOMIC instead of GFP_KERNEL.

Fixes: 925ea0fa5277 ("tty: n_gsm: Fix packet data hex dump output")
Cc: stable <stable@...nel.org>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Link: https://lore.kernel.org/r/20220523155052.57129-1-tony@atomide.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/n_gsm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -454,7 +454,7 @@ static void gsm_hex_dump_bytes(const cha
 		return;
 	}
 
-	prefix = kasprintf(GFP_KERNEL, "%s: ", fname);
+	prefix = kasprintf(GFP_ATOMIC, "%s: ", fname);
 	if (!prefix)
 		return;
 	print_hex_dump(KERN_INFO, prefix, DUMP_PREFIX_OFFSET, 16, 1, data, len,