linux-kernel - [PATCH 3.16 154/305] of: fix autoloading due to broken modalias with no 'compatible'

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Message-ID: <lsq.1471110171.458610730@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Andreas Schwab" <schwab@...ux-m68k.org>,
	"Wolfram Sang" <wsa@...-dreams.de>,
	"Philipp Zabel" <p.zabel@...gutronix.de>,
	"Mathieu Malaterre" <malat@...ian.org>,
	"Michael Ellerman" <mpe@...erman.id.au>
Subject: [PATCH 3.16 154/305] of: fix autoloading due to broken modalias
 with no 'compatible'

3.16.37-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 scripts/mod/file2alias.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -653,7 +653,7 @@ 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);