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msm: ADSPRPC: Size check before allocating memory from DMA

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For allocating memory from DMA we need to do a size check.
This validation is required to avoid any improper paging
request. We already have the range in which the size is
expected to be.

Change-Id: I20a843366a7f3e3e21cef89cf1ea5bec3f93ab2d
Acked-by: Ekansh Gupta <ekangupt@qti.qualcomm.com>
Signed-off-by: Jeya R <jeyr@codeaurora.org>
This commit is contained in:
Jeya R 2020-07-22 16:53:49 +05:30 • committed by Gerrit - the friendly Code Review server
commit 7bb35d6695
1 changed files with 8 additions and 0 deletions
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8
drivers/char/adsprpc.c
View file

@ -909,6 +909,7 @@ static int fastrpc_mmap_find(struct fastrpc_file *fl, int fd,
static int fastrpc_alloc_cma_memory(dma_addr_t *region_phys, void **vaddr,
size_t size, unsigned long dma_attr)
{
int err = 0;
struct fastrpc_apps *me = &gfa;
if (me->dev == NULL) {
@ -916,6 +917,13 @@ static int fastrpc_alloc_cma_memory(dma_addr_t *region_phys, void **vaddr,
"failed to allocate CMA memory, device adsprpc-mem is not initialized\n");
return -ENODEV;
}
VERIFY(err, size > 0 && size < me->max_size_limit);
if (err) {
err = -EFAULT;
pr_err("adsprpc: %s: invalid allocation size 0x%zx\n",
__func__, size);
return err;
}
*vaddr = dma_alloc_attrs(me->dev, size, region_phys,
GFP_KERNEL, dma_attr);
if (IS_ERR_OR_NULL(*vaddr)) {