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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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3
include/linux/lockd/lockd.h
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@ -212,7 +212,8 @@ int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
__be32 nlmclnt_grant(const struct sockaddr *addr,
const struct nlm_lock *lock);
void nlmclnt_recovery(struct nlm_host *);
int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
int nlmclnt_reclaim(struct nlm_host *, struct file_lock *,
struct nlm_rqst *);
void nlmclnt_next_cookie(struct nlm_cookie *);
/*