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of: Fix crash if an earlycon driver is not found

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__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@gmail.com>
Cc: <stable@vger.kernel.org> # 3.16+
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Kevin Cernekee 2014-11-09 00:55:47 -08:00 committed by Rob Herring
parent 66865de431
commit ab74d00a39
1 changed files with 1 additions and 1 deletions
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2
drivers/of/fdt.c
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@ -773,7 +773,7 @@ int __init early_init_dt_scan_chosen_serial(void)
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++;