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* [PATCH] ocfs2: Use zero-sized array and struct_size() in kzalloc()
@ 2019-01-08 19:19 Gustavo A. R. Silva
  0 siblings, 0 replies; only message in thread
From: Gustavo A. R. Silva @ 2019-01-08 19:19 UTC (permalink / raw)
  To: Mark Fasheh, Joel Becker; +Cc: ocfs2-devel, linux-kernel, Gustavo A. R. Silva

Update the code to use a zero-sized array instead of a pointer in
structure ocfs2_slot_info and use struct_size() in kzalloc().

Notice that 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 foo {
    int stuff;
    void *entry[];

instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

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

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <>
 fs/ocfs2/slot_map.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index d7407994f308..ea0756d83250 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -55,7 +55,7 @@ struct ocfs2_slot_info {
 	unsigned int si_blocks;
 	struct buffer_head **si_bh;
 	unsigned int si_num_slots;
-	struct ocfs2_slot *si_slots;
+	struct ocfs2_slot si_slots[];
@@ -420,9 +420,7 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
 	struct inode *inode = NULL;
 	struct ocfs2_slot_info *si;
-	si = kzalloc(sizeof(struct ocfs2_slot_info) +
-		     (sizeof(struct ocfs2_slot) * osb->max_slots),
-		     GFP_KERNEL);
+	si = kzalloc(struct_size(si, si_slots, osb->max_slots), GFP_KERNEL);
 	if (!si) {
 		status = -ENOMEM;
@@ -431,8 +429,6 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
 	si->si_extended = ocfs2_uses_extended_slot_map(osb);
 	si->si_num_slots = osb->max_slots;
-	si->si_slots = (struct ocfs2_slot *)((char *)si +
-					     sizeof(struct ocfs2_slot_info));
 	inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,

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2019-01-08 19:19 [PATCH] ocfs2: Use zero-sized array and struct_size() in kzalloc() Gustavo A. R. Silva

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