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authorSage Weil <sage@newdream.net>2011-03-29 12:11:06 -0700
committerSage Weil <sage@newdream.net>2011-03-29 12:11:06 -0700
commitfbdb9190482fd83a3eb20cdeb0da454759f479d7 (patch)
treebf83dcd6ea13c9a1feedb2a8f79744de93f9fecd /net/ceph/osd_client.c
parent234af26ff123dfb2aa48772124721b1354c8e0a5 (diff)
downloadlwn-fbdb9190482fd83a3eb20cdeb0da454759f479d7.tar.gz
lwn-fbdb9190482fd83a3eb20cdeb0da454759f479d7.zip
libceph: fix null dereference when unregistering linger requests
We should only clear r_osd if we are neither registered as a linger or a regular request. We may unregister as a linger while still registered as a regular request (e.g., in reset_osd). Incorrectly clearing r_osd there leads to a null pointer dereference in __send_request. Also simplify the parallel check in __unregister_request() where we just removed r_osd_item and know it's empty. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'net/ceph/osd_client.c')
-rw-r--r--net/ceph/osd_client.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 03740e8fc9d1..3b91d651fe08 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -837,8 +837,7 @@ static void __unregister_request(struct ceph_osd_client *osdc,
dout("moving osd to %p lru\n", req->r_osd);
__move_osd_to_lru(osdc, req->r_osd);
}
- if (list_empty(&req->r_osd_item) &&
- list_empty(&req->r_linger_item))
+ if (list_empty(&req->r_linger_item))
req->r_osd = NULL;
}
@@ -883,7 +882,8 @@ static void __unregister_linger_request(struct ceph_osd_client *osdc,
dout("moving osd to %p lru\n", req->r_osd);
__move_osd_to_lru(osdc, req->r_osd);
}
- req->r_osd = NULL;
+ if (list_empty(&req->r_osd_item))
+ req->r_osd = NULL;
}
}