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| author | Kevin Cernekee <cernekee@gmail.com> | 2014-11-09 00:55:47 -0800 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2014-11-18 11:35:02 -0600 |
| commit | ab74d00a39f70e1bc34a01322bb59f3750ca7a8c (patch) | |
| tree | 22e4264309f563decae0165926e1171fd98be14c | |
| parent | 66865de4314caca30598244b86817e774c188afa (diff) | |
| download | blackbird-obmc-linux-ab74d00a39f70e1bc34a01322bb59f3750ca7a8c.tar.gz blackbird-obmc-linux-ab74d00a39f70e1bc34a01322bb59f3750ca7a8c.zip | |
of: Fix crash if an earlycon driver is not found
__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>
| -rw-r--r-- | drivers/of/fdt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index d1ffca8b34ea..30e97bcc4f88 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -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++; |
