From: Steven Price <[email protected]>
[ Upstream commit 5d59aa8f9ce972b472201aed86e904bb75879ff0 ]
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/[email protected]
Fixes: 54c7a8916a88 ("initramfs: free initrd memory if opening /initrd.image
fails")
Signed-off-by: Steven Price <[email protected]>
Reported-by: Mark Rutland <[email protected]>
Tested-by: Mark Rutland <[email protected]>
Reviewed-by: Mike Rapoport <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
init/initramfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/init/initramfs.c b/init/initramfs.c
index cd5fb00fcb549..dab8d63459f63 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -524,7 +524,7 @@ static void __init free_initrd(void)
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
#endif
- if (do_retain_initrd)
+ if (do_retain_initrd || !initrd_start)
goto skip;
#ifdef CONFIG_KEXEC_CORE
--
2.20.1
