Commit 47366979 authored by Matt Redfearn's avatar Matt Redfearn Committed by Ralf Baechle

MIPS: KASLR: Fix handling of NULL FDT

If platform code returns a NULL pointer to the FDT, initial_boot_params
will not get set to a valid pointer and attempting to find the /chosen
node in it will cause a NULL pointer dereference and the kernel to crash
immediately on startup - with no output to the console.

Fix this by checking that initial_boot_params is valid before using it.

Fixes: 405bc8fd ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE")
Cc: stable@vger.kernel.org # 4.7+
Signed-off-by: default avatarMatt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14414/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 93032e31
...@@ -200,7 +200,7 @@ static inline __init unsigned long get_random_boot(void) ...@@ -200,7 +200,7 @@ static inline __init unsigned long get_random_boot(void)
#if defined(CONFIG_USE_OF) #if defined(CONFIG_USE_OF)
/* Get any additional entropy passed in device tree */ /* Get any additional entropy passed in device tree */
{ if (initial_boot_params) {
int node, len; int node, len;
u64 *prop; u64 *prop;
......
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