2017-01-27 13:32:10 +00:00
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From: Tobias Wolf <dev-NTEO@vplace.de>
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Date: Wed, 23 Nov 2016 10:40:07 +0100
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Subject: [PATCH] of: Add check to of_scan_flat_dt() before accessing
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initial_boot_params
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An empty __dtb_start to __dtb_end section might result in initial_boot_params
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being null for arch/mips/ralink. This showed that the boot process hangs
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indefinitely in of_scan_flat_dt().
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Signed-off-by: Tobias Wolf <dev-NTEO@vplace.de>
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---
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--- a/drivers/of/fdt.c
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+++ b/drivers/of/fdt.c
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2017-05-26 20:56:32 +00:00
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@@ -741,9 +741,12 @@ int __init of_scan_flat_dt(int (*it)(uns
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2017-01-27 13:32:10 +00:00
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const char *pathp;
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int offset, rc = 0, depth = -1;
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- for (offset = fdt_next_node(blob, -1, &depth);
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- offset >= 0 && depth >= 0 && !rc;
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- offset = fdt_next_node(blob, offset, &depth)) {
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+ if (!blob)
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+ return 0;
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+
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+ for (offset = fdt_next_node(blob, -1, &depth);
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+ offset >= 0 && depth >= 0 && !rc;
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+ offset = fdt_next_node(blob, offset, &depth)) {
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pathp = fdt_get_name(blob, offset, NULL);
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if (*pathp == '/')
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