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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-07-11 20:52:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-12 11:05:41 -0700
commit0e71666b8b9e21e4cb5d805219eb5ed7c5617ca3 (patch)
treec791bc0d2604fe47185af1228fe762ffe1928d6d /fs/ocfs2/dlm
parente926d8a1e8675422e53104855a7bedec82fb570f (diff)
downloadlinux-0e71666b8b9e21e4cb5d805219eb5ed7c5617ca3.tar.bz2
ocfs2/dlm: use struct_size() helper
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 dlm_migratable_lockres { ... struct dlm_migratable_lock ml[0]; // 16 bytes each, begins at byte 112 }; Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes. So, replace the following form: sizeof(struct dlm_migratable_lockres) + (mres->num_locks * sizeof(struct dlm_migratable_lock)) with: struct_size(mres, ml, mres->num_locks) Notice that, in this case, variable sz is not necessary, hence it is removed. This code was detected with the help of Coccinelle. Link: http://lkml.kernel.org/r/20190605204926.GA24467@embeddedor Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Jun Piao <piaojun@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/dlm')
-rw-r--r--fs/ocfs2/dlm/dlmrecovery.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index e22d6a115220..064ce5bbc3f6 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -1109,7 +1109,7 @@ static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
{
u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
int mres_total_locks = be32_to_cpu(mres->total_locks);
- int sz, ret = 0, status = 0;
+ int ret = 0, status = 0;
u8 orig_flags = mres->flags,
orig_master = mres->master;
@@ -1117,9 +1117,6 @@ static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
if (!mres->num_locks)
return 0;
- sz = sizeof(struct dlm_migratable_lockres) +
- (mres->num_locks * sizeof(struct dlm_migratable_lock));
-
/* add an all-done flag if we reached the last lock */
orig_flags = mres->flags;
BUG_ON(total_locks > mres_total_locks);
@@ -1133,7 +1130,8 @@ static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
/* send it */
ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
- sz, send_to, &status);
+ struct_size(mres, ml, mres->num_locks),
+ send_to, &status);
if (ret < 0) {
/* XXX: negative status is not handled.
* this will end up killing this node. */