treewide: kzalloc() -> kcalloc()

The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>

9 files changed, 27 insertions, 23 deletions

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 29024492b8ed..ed607288e696 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -238,9 +238,9 @@ dcssblk_is_continuous(struct dcssblk_dev_info *dev_info)
 	if (dev_info->num_of_segments <= 1)
 		return 0;
 
-	sort_list = kzalloc(
-			sizeof(struct segment_info) * dev_info->num_of_segments,
-			GFP_KERNEL);
+	sort_list = kcalloc(dev_info->num_of_segments,
+			    sizeof(struct segment_info),
+			    GFP_KERNEL);
 	if (sort_list == NULL)
 		return -ENOMEM;
 	i = 0;
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
index db1fbf9b00b5..79eb60958015 100644
--- a/drivers/s390/char/keyboard.c
+++ b/drivers/s390/char/keyboard.c
@@ -78,7 +78,7 @@ kbd_alloc(void) {
 		}
 	}
 	kbd->fn_handler =
-		kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
+		kcalloc(NR_FN_HANDLER, sizeof(fn_handler_fn *), GFP_KERNEL);
 	if (!kbd->fn_handler)
 		goto out_func;
 	kbd->accent_table = kmemdup(ebc_accent_table,
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 52aa89424318..cbde65ab2170 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -242,7 +242,7 @@ static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count,
 	 * That means we allocate room for CCWs to cover count/reclen
 	 * records plus a NOP.
 	 */
-	cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1),
+	cpa = kcalloc(rec_count + 1, sizeof(struct ccw1),
 		      GFP_KERNEL | GFP_DMA);
 	if (!cpa)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 4369662cfff5..76d3c50bf078 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -152,7 +152,7 @@ static int zcore_memmap_open(struct inode *inode, struct file *filp)
 	char *buf;
 	int i = 0;
 
-	buf = kzalloc(memblock.memory.cnt * CHUNK_INFO_SIZE, GFP_KERNEL);
+	buf = kcalloc(memblock.memory.cnt, CHUNK_INFO_SIZE, GFP_KERNEL);
 	if (!buf) {
 		return -ENOMEM;
 	}
diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index 4c14ce428e92..78f1be41b05e 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -536,7 +536,7 @@ void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 
 int qdio_enable_async_operation(struct qdio_output_q *outq)
 {
-	outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
+	outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *),
 			     GFP_ATOMIC);
 	if (!outq->aobs) {
 		outq->use_cq = 0;
diff --git a/drivers/s390/cio/qdio_thinint.c b/drivers/s390/cio/qdio_thinint.c
index 0787b587e4b8..07dea602205b 100644
--- a/drivers/s390/cio/qdio_thinint.c
+++ b/drivers/s390/cio/qdio_thinint.c
@@ -241,8 +241,9 @@ out:
 /* allocate non-shared indicators and shared indicator */
 int __init tiqdio_allocate_memory(void)
 {
-	q_indicators = kzalloc(sizeof(struct indicator_t) * TIQDIO_NR_INDICATORS,
-			     GFP_KERNEL);
+	q_indicators = kcalloc(TIQDIO_NR_INDICATORS,
+			       sizeof(struct indicator_t),
+			       GFP_KERNEL);
 	if (!q_indicators)
 		return -ENOMEM;
 	return 0;
diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c
index a9ae827cc1ce..3929c8be8098 100644
--- a/drivers/s390/crypto/pkey_api.c
+++ b/drivers/s390/crypto/pkey_api.c
@@ -121,7 +121,7 @@ static int alloc_and_prep_cprbmem(size_t paramblen,
 	 * allocate consecutive memory for request CPRB, request param
 	 * block, reply CPRB and reply param block
 	 */
-	cprbmem = kzalloc(2 * cprbplusparamblen, GFP_KERNEL);
+	cprbmem = kcalloc(2, cprbplusparamblen, GFP_KERNEL);
 	if (!cprbmem)
 		return -ENOMEM;
 
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index 7ce98b70cad3..7617d21cb296 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -1379,7 +1379,7 @@ static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
 	} else
 		ccw_num = 8;
 
-	ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
+	ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
 	if (ch->ccw == NULL)
 					goto nomem_return;
 
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 9f28b6f2efc4..8e1474f1ffac 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -374,9 +374,10 @@ static int qeth_alloc_cq(struct qeth_card *card)
 		}
 		card->qdio.no_in_queues = 2;
 		card->qdio.out_bufstates =
-			kzalloc(card->qdio.no_out_queues *
-				QDIO_MAX_BUFFERS_PER_Q *
-				sizeof(struct qdio_outbuf_state), GFP_KERNEL);
+			kcalloc(card->qdio.no_out_queues *
+					QDIO_MAX_BUFFERS_PER_Q,
+				sizeof(struct qdio_outbuf_state),
+				GFP_KERNEL);
 		outbuf_states = card->qdio.out_bufstates;
 		if (outbuf_states == NULL) {
 			rc = -1;
@@ -2538,8 +2539,9 @@ static int qeth_alloc_qdio_buffers(struct qeth_card *card)
 
 	/* outbound */
 	card->qdio.out_qs =
-		kzalloc(card->qdio.no_out_queues *
-			sizeof(struct qeth_qdio_out_q *), GFP_KERNEL);
+		kcalloc(card->qdio.no_out_queues,
+			sizeof(struct qeth_qdio_out_q *),
+			GFP_KERNEL);
 	if (!card->qdio.out_qs)
 		goto out_freepool;
 	for (i = 0; i < card->qdio.no_out_queues; ++i) {
@@ -4963,8 +4965,8 @@ static int qeth_qdio_establish(struct qeth_card *card)
 
 	QETH_DBF_TEXT(SETUP, 2, "qdioest");
 
-	qib_param_field = kzalloc(QDIO_MAX_BUFFERS_PER_Q * sizeof(char),
-			      GFP_KERNEL);
+	qib_param_field = kzalloc(QDIO_MAX_BUFFERS_PER_Q,
+				  GFP_KERNEL);
 	if (!qib_param_field) {
 		rc =  -ENOMEM;
 		goto out_free_nothing;
@@ -4973,8 +4975,8 @@ static int qeth_qdio_establish(struct qeth_card *card)
 	qeth_create_qib_param_field(card, qib_param_field);
 	qeth_create_qib_param_field_blkt(card, qib_param_field);
 
-	in_sbal_ptrs = kzalloc(card->qdio.no_in_queues *
-			       QDIO_MAX_BUFFERS_PER_Q * sizeof(void *),
+	in_sbal_ptrs = kcalloc(card->qdio.no_in_queues * QDIO_MAX_BUFFERS_PER_Q,
+			       sizeof(void *),
 			       GFP_KERNEL);
 	if (!in_sbal_ptrs) {
 		rc = -ENOMEM;
@@ -4985,7 +4987,7 @@ static int qeth_qdio_establish(struct qeth_card *card)
 			virt_to_phys(card->qdio.in_q->bufs[i].buffer);
 	}
 
-	queue_start_poll = kzalloc(sizeof(void *) * card->qdio.no_in_queues,
+	queue_start_poll = kcalloc(card->qdio.no_in_queues, sizeof(void *),
 				   GFP_KERNEL);
 	if (!queue_start_poll) {
 		rc = -ENOMEM;
@@ -4997,8 +4999,9 @@ static int qeth_qdio_establish(struct qeth_card *card)
 	qeth_qdio_establish_cq(card, in_sbal_ptrs, queue_start_poll);
 
 	out_sbal_ptrs =
-		kzalloc(card->qdio.no_out_queues * QDIO_MAX_BUFFERS_PER_Q *
-			sizeof(void *), GFP_KERNEL);
+		kcalloc(card->qdio.no_out_queues * QDIO_MAX_BUFFERS_PER_Q,
+			sizeof(void *),
+			GFP_KERNEL);
 	if (!out_sbal_ptrs) {
 		rc = -ENOMEM;
 		goto out_free_queue_start_poll;