linux-kernel - [PATCH 4.4 018/146] of: fix autoloading due to broken modalias with no compatible

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Message-Id: <20160725203522.129839459@linuxfoundation.org>
Date:	Mon, 25 Jul 2016 13:54:33 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mathieu Malaterre <malat@...ian.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.4 018/146] of: fix autoloading due to broken modalias with no compatible

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

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

From: Wolfram Sang <wsa@...-dreams.de>

commit b3c0a4dab7e35a9b6d69c0415641d2280fdefb2b upstream.

Because of an improper dereference, a stray 'C' character was output to
the modalias when no 'compatible' was specified. This is the case for
some old PowerMac drivers which only set the 'name' property. Fix it to
let them match again.

Reported-by: Mathieu Malaterre <malat@...ian.org>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Tested-by: Mathieu Malaterre <malat@...ian.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Andreas Schwab <schwab@...ux-m68k.org>
Fixes: 6543becf26fff6 ("mod/file2alias: make modalias generation safe for cross compiling")
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 scripts/mod/file2alias.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -695,7 +695,7 @@ static int do_of_entry (const char *file
 	len = sprintf(alias, "of:N%sT%s", (*name)[0] ? *name : "*",
 		      (*type)[0] ? *type : "*");
 
-	if (compatible[0])
+	if ((*compatible)[0])
 		sprintf(&alias[len], "%sC%s", (*type)[0] ? "*" : "",
 			*compatible);