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| author | Tobias Wolf <dev-NTEO@vplace.de> | 2016-11-23 12:40:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-29 14:00:31 +0300 |
| commit | dcd015f733a74552eeefc5d70f55125c33eaa5d2 (patch) | |
| tree | 8b33aa04fb5675457f79e4b05e3b6eca4b16a2f6 /drivers/of | |
| parent | f2060387421109ac389dd209355918b566fc6f84 (diff) | |
| download | linux-dcd015f733a74552eeefc5d70f55125c33eaa5d2.tar.xz | |
of: Add check to of_scan_flat_dt() before accessing initial_boot_params
commit 3ec754410cb3e931a6c4920b1a150f21a94a2bf4 upstream.
An empty __dtb_start to __dtb_end section might result in
initial_boot_params being null for arch/mips/ralink. This showed that the
boot process hangs indefinitely in of_scan_flat_dt().
Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14605/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/fdt.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 6a43fd3d0576..502f5547a1f2 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -741,9 +741,12 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, const char *pathp; int offset, rc = 0, depth = -1; - for (offset = fdt_next_node(blob, -1, &depth); - offset >= 0 && depth >= 0 && !rc; - offset = fdt_next_node(blob, offset, &depth)) { + if (!blob) + return 0; + + for (offset = fdt_next_node(blob, -1, &depth); + offset >= 0 && depth >= 0 && !rc; + offset = fdt_next_node(blob, offset, &depth)) { pathp = fdt_get_name(blob, offset, NULL); if (*pathp == '/') |