From 5d59aa8f9ce972b472201aed86e904bb75879ff0 Mon Sep 17 00:00:00 2001 From: Steven Price Date: Fri, 17 May 2019 14:31:47 -0700 Subject: [PATCH] initramfs: don't free a non-existent initrd Since commit 54c7a8916a88 ("initramfs: free initrd memory if opening /initrd.image fails"), the kernel has unconditionally attempted to free the initrd even if it doesn't exist. In the non-existent case this causes a boot-time splat if CONFIG_DEBUG_VIRTUAL is enabled due to a call to virt_to_phys() with a NULL address. Instead we should check that the initrd actually exists and only attempt to free it if it does. Link: http://lkml.kernel.org/r/20190516143125.48948-1-steven.price@arm.com Fixes: 54c7a8916a88 ("initramfs: free initrd memory if opening /initrd.image fails") Signed-off-by: Steven Price Reported-by: Mark Rutland Tested-by: Mark Rutland Reviewed-by: Mike Rapoport Cc: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/initramfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/init/initramfs.c b/init/initramfs.c index 435a428c2af1..178130fd61c2 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -669,7 +669,7 @@ done: * If the initrd region is overlapped with crashkernel reserved region, * free only memory that is not part of crashkernel region. */ - if (!do_retain_initrd && !kexec_free_initrd()) + if (!do_retain_initrd && initrd_start && !kexec_free_initrd()) free_initrd_mem(initrd_start, initrd_end); initrd_start = 0; initrd_end = 0;