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| author |   Kees Cook <keescook@chromium.org> | 2022-03-09 09:37:31 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-03-31 11:19:25 -0700 |
| commit | 229a08a4f4e4f9949801cc39b6480ddc9c487183 (patch) | |
| tree | 99ba87442ac1db9a7b64b2d998bf4e295ee6bdea /include | |
| parent | usercopy: Disable CONFIG_HARDENED_USERCOPY_PAGESPAN (diff) | |
| download | linux-dev-229a08a4f4e4f9949801cc39b6480ddc9c487183.tar.xz linux-dev-229a08a4f4e4f9949801cc39b6480ddc9c487183.zip | |
ARM/dma-mapping: Remove CMA code when not built with CMA
The MAX_CMA_AREAS could be set to 0, which would result in code that would
attempt to operate beyond the end of a zero-sized array. If CONFIG_CMA
is disabled, just remove this code entirely. Found when building arm
on GCC 10.x for several defconfigs (e.g. axm55xx_defconfig) under
-Warray-bounds:
arch/arm/mm/dma-mapping.c:396:22: warning: array subscript <unknown> is outside array bounds of 'struct dma_contig_early_reserve[0]' [-Warray-bounds]
396 | dma_mmu_remap[dma_mmu_remap_num].size = size;
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
arch/arm/mm/dma-mapping.c:389:40: note: while referencing 'dma_mmu_remap'
389 | static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata;
| ^~~~~~~~~~~~~
Cc: Russell King <linux@armlinux.org.uk>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Martin Oliveira <martin.oliveira@eideticom.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/all/6243ee60.1c69fb81.16de6.7dbf@mx.google.com/
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/lkml/20220310070041.GA24874@lst.de
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/lkml/9059fa71-330f-f04f-b155-2850abb72a71@redhat.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cma.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/include/linux/cma.h b/include/linux/cma.h index bd801023504b..2c2ede7f0724 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -12,10 +12,6 @@ */ #ifdef CONFIG_CMA_AREAS #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS) - -#else -#define MAX_CMA_AREAS (0) - #endif #define CMA_MAX_NAME 64 |