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xsk: Fix number of pinned pages/umem size discrepancy #12

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Merged
baruchsiach merged 1 commit into from
Sep 5, 2021
Merged

xsk: Fix number of pinned pages/umem size discrepancy #12

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17 changes: 8 additions & 9 deletions net/xdp/xdp_umem.c
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Original file line number Diff line number Diff line change
Expand Up @@ -303,10 +303,10 @@ static int xdp_umem_account_pages(struct xdp_umem *umem)

static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
{
u32 npgs_rem, chunk_size = mr->chunk_size, headroom = mr->headroom;
bool unaligned_chunks = mr->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG;
u32 chunk_size = mr->chunk_size, headroom = mr->headroom;
u64 npgs, addr = mr->addr, size = mr->len;
unsigned int chunks, chunks_per_page;
unsigned int chunks, chunks_rem;
int err;

if (chunk_size < XDP_UMEM_MIN_CHUNK_SIZE || chunk_size > PAGE_SIZE) {
Expand Down Expand Up @@ -336,19 +336,18 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
if ((addr + size) < addr)
return -EINVAL;

npgs = size >> PAGE_SHIFT;
npgs = div_u64_rem(size, PAGE_SIZE, &npgs_rem);
if (npgs_rem)
npgs++;
if (npgs > U32_MAX)
return -EINVAL;

chunks = (unsigned int)div_u64(size, chunk_size);
chunks = (unsigned int)div_u64_rem(size, chunk_size, &chunks_rem);
if (chunks == 0)
return -EINVAL;

if (!unaligned_chunks) {
chunks_per_page = PAGE_SIZE / chunk_size;
if (chunks < chunks_per_page || chunks % chunks_per_page)
return -EINVAL;
}
if (!unaligned_chunks && chunks_rem)
return -EINVAL;

if (headroom >= chunk_size - XDP_PACKET_HEADROOM)
return -EINVAL;
Expand Down