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lockd: nlmclnt_reclaim(): avoid stack overflow

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Even though nlmclnt_reclaim() is only one call into the stack frame,
928 bytes on the stack seems like a lot. Recode to dynamically
allocate the request structure once from within the reclaimer task,
then pass this pointer into nlmclnt_reclaim() for reuse on
subsequent calls.

smatch analysis:

fs/lockd/clntproc.c:620 nlmclnt_reclaim() warn: 'reqst' puts
 928 bytes on stack

Also remove redundant assignment of 0 after memset.

Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Tim Gardner
2013-02-13 08:40:16 -07:00
committed by J. Bruce Fields
parent deb4534f4f
commit f25cc71e63
3 changed files with 15 additions and 6 deletions
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6
fs/lockd/clntproc.c
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@@ -615,17 +615,15 @@ out_unlock:
* RECLAIM: Try to reclaim a lock
*/
int
nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl,
struct nlm_rqst *req)
{
struct nlm_rqst reqst, *req;
int status;
req = &reqst;
memset(req, 0, sizeof(*req));
locks_init_lock(&req->a_args.lock.fl);
locks_init_lock(&req->a_res.lock.fl);
req->a_host = host;
req->a_flags = 0;
/* Set up the argument struct */
nlmclnt_setlockargs(req, fl);