scsi: mvsas: Use struct_size() in kzalloc()
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Message ID 20190619140227.GA9877@embeddedor
State Deferred
Headers show
  • scsi: mvsas: Use struct_size() in kzalloc()
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Commit Message

Gustavo A. R. Silva June 19, 2019, 2:02 p.m. UTC
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct mvs_info {
        struct mvs_slot_info slot_info[0];

instance = kzalloc(sizeof(sizeof(*mvi) + count * sizeof(struct mvs_slot_info),

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = kzalloc(struct_size(mvi, slot_info, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <>
 drivers/scsi/mvsas/mv_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
index da719b0694dc..3f2022fd2335 100644
--- a/drivers/scsi/mvsas/mv_init.c
+++ b/drivers/scsi/mvsas/mv_init.c
@@ -350,9 +350,9 @@  static struct mvs_info *mvs_pci_alloc(struct pci_dev *pdev,
 	struct mvs_info *mvi = NULL;
 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
-	mvi = kzalloc(sizeof(*mvi) +
-		(1L << mvs_chips[ent->driver_data].slot_width) *
-		sizeof(struct mvs_slot_info), GFP_KERNEL);
+	mvi = kzalloc(struct_size(mvi, slot_info,
+		      1L << mvs_chips[ent->driver_data].slot_width),
+		      GFP_KERNEL);
 	if (!mvi)
 		return NULL;