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authorMatt Redfearn <matt.redfearn@imgtec.com>2016-10-17 17:21:46 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-11-04 00:30:49 +0100
commit4736697963385e6257ee8e260e97347e858cd962 (patch)
tree31a16594af6cbdf511dadea88664a213e44a52d8
parent93032e31a5f12df847639db3ad0b7f300bf44b7b (diff)
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: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE") Cc: stable@vger.kernel.org # 4.7+ Signed-off-by: Matt 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: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/kernel/relocate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/kernel/relocate.c b/arch/mips/kernel/relocate.c
index ca1cc30c0891..1958910b75c0 100644
--- a/arch/mips/kernel/relocate.c
+++ b/arch/mips/kernel/relocate.c
@@ -200,7 +200,7 @@ static inline __init unsigned long get_random_boot(void)
#if defined(CONFIG_USE_OF)
/* Get any additional entropy passed in device tree */
- {
+ if (initial_boot_params) {
int node, len;
u64 *prop;