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| author |   Len Baker <len.baker@gmx.com> | 2021-09-18 12:40:55 +0200 |
|---|---|---|
| committer |   Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-10-20 18:35:22 -0500 |
| commit | 50740d5de6145cb88e69ccb29c586f10c401e3ee (patch) | |
| tree | 78c3d1f42615fc31cfd75a3f98ac8a12cd1fd347 /drivers/dma | |
| parent | KVM: PPC: Replace zero-length array with flexible array member (diff) | |
| download | linux-dev-50740d5de6145cb88e69ccb29c586f10c401e3ee.tar.xz linux-dev-50740d5de6145cb88e69ccb29c586f10c401e3ee.zip | |
dmaengine: pxa_dma: Prefer struct_size over open coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.
So, use the struct_size() helper to do the arithmetic instead of the
argument "size + count * size" in the kzalloc() function.
[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
Signed-off-by: Len Baker <len.baker@gmx.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/pxa_dma.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c index 4a2a796e348c..52d04641e361 100644 --- a/drivers/dma/pxa_dma.c +++ b/drivers/dma/pxa_dma.c @@ -742,8 +742,7 @@ pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc) dma_addr_t dma; int i; - sw_desc = kzalloc(sizeof(*sw_desc) + - nb_hw_desc * sizeof(struct pxad_desc_hw *), + sw_desc = kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc), GFP_NOWAIT); if (!sw_desc) return NULL; |