From: Paul Cercueil paul@crapouillou.net
commit 4d4f9c1a17a3480f8fe523673f7232b254d724b7 upstream.
The compressed payload is not necesarily 4-byte aligned, at least when compiling with Clang. In that case, the 4-byte value appended to the compressed payload that corresponds to the uncompressed kernel image size must be read using get_unaligned_le32().
This fixes Clang-built kernels not booting on MIPS (tested on a Ingenic JZ4770 board).
Fixes: b8f54f2cde78 ("MIPS: ZBOOT: copy appended dtb to the end of the kernel") Cc: stable@vger.kernel.org # v4.7 Signed-off-by: Paul Cercueil paul@crapouillou.net Reviewed-by: Nick Desaulniers ndesaulniers@google.com Reviewed-by: Philippe Mathieu-Daudé f4bug@amsat.org Signed-off-by: Thomas Bogendoerfer tsbogend@alpha.franken.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/mips/boot/compressed/decompress.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/mips/boot/compressed/decompress.c +++ b/arch/mips/boot/compressed/decompress.c @@ -17,6 +17,7 @@ #include <linux/libfdt.h>
#include <asm/addrspace.h> +#include <asm/unaligned.h>
/* * These two variables specify the free mem region @@ -124,7 +125,7 @@ void decompress_kernel(unsigned long boo dtb_size = fdt_totalsize((void *)&__appended_dtb);
/* last four bytes is always image size in little endian */ - image_size = le32_to_cpup((void *)&__image_end - 4); + image_size = get_unaligned_le32((void *)&__image_end - 4);
/* copy dtb to where the booted kernel will expect it */ memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,