pds_core: use vmalloc_array and vcalloc

Use vmalloc_array and vcalloc to protect against
multiplication overflows.

The changes were done using the following Coccinelle
semantic patch:

// <smpl>
@initialize:ocaml@
@@

let rename alloc =
  match alloc with
    "vmalloc" -> "vmalloc_array"
  | "vzalloc" -> "vcalloc"
  | _ -> failwith "unknown"

@@
    size_t e1,e2;
    constant C1, C2;
    expression E1, E2, COUNT, x1, x2, x3;
    typedef u8;
    typedef __u8;
    type t = {u8,__u8,char,unsigned char};
    identifier alloc = {vmalloc,vzalloc};
    fresh identifier realloc = script:ocaml(alloc) { rename alloc };
@@

(
      alloc(x1*x2*x3)
|
      alloc(C1 * C2)
|
      alloc((sizeof(t)) * (COUNT), ...)
|
-     alloc((e1) * (e2))
+     realloc(e1, e2)
|
-     alloc((e1) * (COUNT))
+     realloc(COUNT, e1)
|
-     alloc((E1) * (E2))
+     realloc(E1, E2)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Link: https://lore.kernel.org/r/20230627144339.144478-10-Julia.Lawall@inria.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/amd/pds_core/core.c b/drivers/net/ethernet/amd/pds_core/core.c
index 483a070d96fa9c23f8a2986f9a4597b92b0a9eac..f2c79456d74525e3dc8ca47fa620161ba5a1ce1a 100644 (file)
--- a/drivers/net/ethernet/amd/pds_core/core.c
+++ b/drivers/net/ethernet/amd/pds_core/core.c
@@ -196,7 +196,7 @@ int pdsc_qcq_alloc(struct pdsc *pdsc, unsigned int type, unsigned int index,
        dma_addr_t q_base_pa;
        int err;
 
-       qcq->q.info = vzalloc(num_descs * sizeof(*qcq->q.info));
+       qcq->q.info = vcalloc(num_descs, sizeof(*qcq->q.info));
        if (!qcq->q.info) {
                err = -ENOMEM;
                goto err_out;
@@ -219,7 +219,7 @@ int pdsc_qcq_alloc(struct pdsc *pdsc, unsigned int type, unsigned int index,
        if (err)
                goto err_out_free_q_info;
 
-       qcq->cq.info = vzalloc(num_descs * sizeof(*qcq->cq.info));
+       qcq->cq.info = vcalloc(num_descs, sizeof(*qcq->cq.info));
        if (!qcq->cq.info) {
                err = -ENOMEM;
                goto err_out_free_irq;