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39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
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From e813f48461b8011244b3e7dfe118cf94fd595f0d Mon Sep 17 00:00:00 2001
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From: Markus Stockhausen <markus.stockhausen@gmx.de>
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Date: Sun, 25 Aug 2024 13:09:48 -0400
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Subject: [PATCH] realtek: harden fw_init_cmdline()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Some devices (e.g. HP JG924A) hand over other than expected kernel boot
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arguments. Looking at these one can see:
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fw_init_cmdline: fw_arg0=00020000
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fw_init_cmdline: fw_arg1=00060000
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fw_init_cmdline: fw_arg2=fffdffff
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fw_init_cmdline: fw_arg3=0000416c
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Especially fw_arg2 should be the pointer to the environment and it looks
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very suspicous. It is not aligned and the address is outside KSEG0 and
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KSEG1. Booting the device will result in a hang. Do better at verifying
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the address.
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Signed-off-by: Bjørn Mork <bjorn@mork.no>
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Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
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---
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arch/mips/fw/lib/cmdline.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/mips/fw/lib/cmdline.c
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+++ b/arch/mips/fw/lib/cmdline.c
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@@ -31,7 +31,7 @@ void __init fw_init_cmdline(void)
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}
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/* Validate environment pointer. */
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- if (fw_arg2 < CKSEG0)
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+ if (fw_arg2 < CKSEG0 || fw_arg2 >= CKSEG2)
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_fw_envp = NULL;
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else
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_fw_envp = (int *)fw_arg2;
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