linux-kernel - [PATCH 3.17 075/122] of: Fix crash if an earlycon driver is not found

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Message-Id: <20141205223317.075077519@linuxfoundation.org>
Date:	Fri,  5 Dec 2014 14:44:09 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kevin Cernekee <cernekee@...il.com>,
	Rob Herring <robh@...nel.org>
Subject: [PATCH 3.17 075/122] of: Fix crash if an earlycon driver is not found

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

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

From: Kevin Cernekee <cernekee@...il.com>

commit ab74d00a39f70e1bc34a01322bb59f3750ca7a8c upstream.

__earlycon_of_table_sentinel.compatible is a char[128], not a pointer, so
it will never be NULL.  Checking it against NULL causes the match loop to
run past the end of the array, and eventually match a bogus entry, under
the following conditions:

 - Kernel command line specifies "earlycon" with no parameters
 - DT has a stdout-path pointing to a UART node
 - The UART driver doesn't use OF_EARLYCON_DECLARE (or maybe the console
   driver is compiled out)

Fix this by checking to see if match->compatible is a non-empty string.

Signed-off-by: Kevin Cernekee <cernekee@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/of/fdt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -773,7 +773,7 @@ int __init early_init_dt_scan_chosen_ser
 	if (offset < 0)
 		return -ENODEV;
 
-	while (match->compatible) {
+	while (match->compatible[0]) {
 		unsigned long addr;
 		if (fdt_node_check_compatible(fdt, offset, match->compatible)) {
 			match++;


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