From: Trond Myklebust Date: Fri, 9 Dec 2011 21:31:52 +0000 (-0500) Subject: NFSv4: Ensure correct locking when accessing the 'lock_states' list X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4b44b40e04a758e2242ff4a3f7c15982801ec8bc;p=linux-beck.git NFSv4: Ensure correct locking when accessing the 'lock_states' list There are currently 2 places in the state recovery code, where we do not take sufficient precautions before accessing the state->lock_states. In both cases, we should be holding the state->state_lock. Reported-by: Pascal Bouchareine Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index da8d73ed9e0f..6a7107ae6b72 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -1156,11 +1156,13 @@ restart: if (status >= 0) { status = nfs4_reclaim_locks(state, ops); if (status >= 0) { + spin_lock(&state->state_lock); list_for_each_entry(lock, &state->lock_states, ls_locks) { if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) printk("%s: Lock reclaim failed!\n", __func__); } + spin_unlock(&state->state_lock); nfs4_put_open_state(state); goto restart; } @@ -1224,10 +1226,12 @@ static void nfs4_clear_open_state(struct nfs4_state *state) clear_bit(NFS_O_RDONLY_STATE, &state->flags); clear_bit(NFS_O_WRONLY_STATE, &state->flags); clear_bit(NFS_O_RDWR_STATE, &state->flags); + spin_lock(&state->state_lock); list_for_each_entry(lock, &state->lock_states, ls_locks) { lock->ls_seqid.flags = 0; lock->ls_flags &= ~NFS_LOCK_INITIALIZED; } + spin_unlock(&state->state_lock); } static void nfs4_reset_seqids(struct nfs_server *server,