He Zhe a3ceed87b0 dma-mapping: fix panic caused by passing empty cma command line argument ... early_cma does not check input argument before passing it to simple_strtoull. The argument would be a NULL pointer if "cma", without its value, is set in command line and thus causes the following panic. PANIC: early exception 0xe3 IP 10:ffffffffa3e9db8d error 0 cr2 0x0 [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc3-yocto-standard+ #7 [ 0.000000] RIP: 0010:_parse_integer_fixup_radix+0xd/0x70 ... [ 0.000000] Call Trace: [ 0.000000] simple_strtoull+0x29/0x70 [ 0.000000] memparse+0x26/0x90 [ 0.000000] early_cma+0x17/0x6a [ 0.000000] do_early_param+0x57/0x8e [ 0.000000] parse_args+0x208/0x320 [ 0.000000] ? rdinit_setup+0x30/0x30 [ 0.000000] parse_early_options+0x29/0x2d [ 0.000000] ? rdinit_setup+0x30/0x30 [ 0.000000] parse_early_param+0x36/0x4d [ 0.000000] setup_arch+0x336/0x99e [ 0.000000] start_kernel+0x6f/0x4e6 [ 0.000000] x86_64_start_reservations+0x24/0x26 [ 0.000000] x86_64_start_kernel+0x6f/0x72 [ 0.000000] secondary_startup_64+0xa4/0xb0 This patch adds a check to prevent the panic. Signed-off-by: He Zhe <zhe.he@windriver.com> Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> Cc: stable@vger.kernel.org Signed-off-by: Christoph Hellwig <hch@lst.de>		2018-09-20 09:01:08 +02:00
..
coherent.c
contiguous.c	dma-mapping: fix panic caused by passing empty cma command line argument	2018-09-20 09:01:08 +02:00
debug.c
direct.c	kernel/dma/direct: take DMA offset into account in dma_direct_supported	2018-09-01 15:42:28 +02:00
Kconfig
Makefile
mapping.c	dma-mapping: remove dma_deconfigure	2018-09-08 11:19:28 +02:00
noncoherent.c	dma-noncoherent: add a arch_sync_dma_for_cpu_all hook	2018-06-24 09:27:27 -07:00
swiotlb.c	swiotlb: clean up reporting	2018-07-25 13:33:05 +02:00
virt.c