From dd47e1bbd89e4aa84c9dcf4e007de5a0457730ea Mon Sep 17 00:00:00 2001 From: Jiffin Tony Thottan Date: Mon, 7 Aug 2017 23:47:00 +0530 Subject: [PATCH 597/601] nfs: add NULL check for call state in nfs3_call_state_wipe Refcounting added for nfs call state in https://review.gluster.org/17696. This is based on assumption that call state won't NULL when it is freed. But currently gluster nfs server is crashing in different scenarios at nfs3_getattr() with following bt #0 0x00007ff1cfea9205 in _gf_ref_put (ref=ref@entry=0x0) at refcount.c:36 #1 0x00007ff1c1997455 in nfs3_call_state_wipe (cs=cs@entry=0x0) at nfs3.c:559 #2 0x00007ff1c1998931 in nfs3_getattr (req=req@entry=0x7ff1bc0b26d0, fh=fh@entry=0x7ff1c2f76ae0) at nfs3.c:962 #3 0x00007ff1c1998c8a in nfs3svc_getattr (req=0x7ff1bc0b26d0) at nfs3.c:987 #4 0x00007ff1cfbfd8c5 in rpcsvc_handle_rpc_call (svc=0x7ff1bc03e500, trans=trans@entry=0x7ff1bc0c8020, msg=) at rpcsvc.c:695 #5 0x00007ff1cfbfdaab in rpcsvc_notify (trans=0x7ff1bc0c8020, mydata=, event=, data=) at rpcsvc.c:789 #6 0x00007ff1cfbff9e3 in rpc_transport_notify (this=this@entry=0x7ff1bc0c8020, event=event@entry=RPC_TRANSPORT_MSG_RECEIVED, data=data@entry=0x7ff1bc0038d0) at rpc-transport.c:538 #7 0x00007ff1c4a2e3d6 in socket_event_poll_in (this=this@entry=0x7ff1bc0c8020, notify_handled=) at socket.c:2306 #8 0x00007ff1c4a3097c in socket_event_handler (fd=21, idx=9, gen=19, data=0x7ff1bc0c8020, poll_in=1, poll_out=0, poll_err=0) at socket.c:2458 #9 0x00007ff1cfe950f6 in event_dispatch_epoll_handler (event=0x7ff1c2f76e80, event_pool=0x5618154d5ee0) at event-epoll.c:572 #10 event_dispatch_epoll_worker (data=0x56181551cbd0) at event-epoll.c:648 #11 0x00007ff1cec99e25 in start_thread () from /lib64/libpthread.so.0 #12 0x00007ff1ce56634d in clone () from /lib64/libc.so.6 This patch add previous NULL check move from __nfs3_call_state_wipe() to nfs3_call_state_wipe() Cherry picked from commit 111d6bda9259126b0429113c9b8ba479958a4398: > Change-Id: I2d73632f4be23f14d8467be3d908b09b3a2d87ea > BUG: 1479030 > Signed-off-by: Jiffin Tony Thottan > Reviewed-on: https://review.gluster.org/17989 > Smoke: Gluster Build System > CentOS-regression: Gluster Build System > Reviewed-by: Niels de Vos Change-Id: I2d73632f4be23f14d8467be3d908b09b3a2d87ea BUG: 1476871 Signed-off-by: Jiffin Tony Thottan Reviewed-on: https://code.engineering.redhat.com/gerrit/114663 Reviewed-by: Niels de Vos Reviewed-by: Atin Mukherjee --- xlators/nfs/server/src/nfs3.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/xlators/nfs/server/src/nfs3.c b/xlators/nfs/server/src/nfs3.c index 52b948e..6339b3f 100644 --- a/xlators/nfs/server/src/nfs3.c +++ b/xlators/nfs/server/src/nfs3.c @@ -495,9 +495,6 @@ typedef ssize_t (*nfs3_serializer) (struct iovec outmsg, void *args); static void __nfs3_call_state_wipe (nfs3_call_state_t *cs) { - if (!cs) - return; - if (cs->fd) { gf_msg_trace (GF_NFS3, 0, "fd 0x%lx ref: %d", (long)cs->fd, cs->fd->refcount); @@ -556,6 +553,10 @@ err: void nfs3_call_state_wipe (nfs3_call_state_t *cs) { + if (!cs) { + gf_log_callingfn ("nfs", GF_LOG_WARNING, "nfs calling state NULL"); + return; + } GF_REF_PUT (cs); } -- 1.8.3.1