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From:   Julia Lawall <Julia.Lawall@inria.fr>
To:     Oded Gabbay <ogabbay@kernel.org>
Cc:     kernel-janitors@vger.kernel.org, keescook@chromium.org,
        christophe.jaillet@wanadoo.fr, kuba@kernel.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 15/24] habanalabs: use vmalloc_array and vcalloc
Date:   Tue, 27 Jun 2023 16:43:30 +0200
Message-Id: <20230627144339.144478-16-Julia.Lawall@inria.fr>
In-Reply-To: <20230627144339.144478-1-Julia.Lawall@inria.fr>
References: <20230627144339.144478-1-Julia.Lawall@inria.fr>
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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>

---
v2: Use vmalloc_array and vcalloc instead of array_size.
This also leaves a multiplication of a constant by a sizeof
as is.  Two patches are thus dropped from the series.

 drivers/accel/habanalabs/common/device.c     |    3 ++-
 drivers/accel/habanalabs/common/state_dump.c |    7 ++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff -u -p a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c
@@ -2594,7 +2594,8 @@ static void hl_capture_user_mappings(str
 	 */
 	vfree(pgf_info->user_mappings);
 	pgf_info->user_mappings =
-			vzalloc(pgf_info->num_of_user_mappings * sizeof(struct hl_user_mapping));
+			vcalloc(pgf_info->num_of_user_mappings,
+				sizeof(struct hl_user_mapping));
 	if (!pgf_info->user_mappings) {
 		pgf_info->num_of_user_mappings = 0;
 		goto finish;
diff -u -p a/drivers/accel/habanalabs/common/state_dump.c b/drivers/accel/habanalabs/common/state_dump.c
--- a/drivers/accel/habanalabs/common/state_dump.c
+++ b/drivers/accel/habanalabs/common/state_dump.c
@@ -272,7 +272,8 @@ static u32 *hl_state_dump_read_sync_obje
 	base_addr = sds->props[SP_SYNC_OBJ_BASE_ADDR] +
 			sds->props[SP_NEXT_SYNC_OBJ_ADDR] * index;
 
-	sync_objects = vmalloc(sds->props[SP_SYNC_OBJ_AMOUNT] * sizeof(u32));
+	sync_objects = vmalloc_array(sds->props[SP_SYNC_OBJ_AMOUNT],
+				     sizeof(u32));
 	if (!sync_objects)
 		return NULL;
 
@@ -453,8 +454,8 @@ hl_state_dump_alloc_read_sm_block_monito
 	s64 base_addr; /* Base addr can be negative */
 	int i;
 
-	monitors = vmalloc(sds->props[SP_MONITORS_AMOUNT] *
-			   sizeof(struct hl_mon_state_dump));
+	monitors = vmalloc_array(sds->props[SP_MONITORS_AMOUNT],
+				 sizeof(struct hl_mon_state_dump));
 	if (!monitors)
 		return NULL;