From: Benjamin Coddington <bcodding@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit c68a027c05709330fe5b2f50c50d5fa02124b5d8 upstream.
If clp->cl_cb_ident is zero, then nfs_cb_idr_remove_locked() skips removing
it when the nfs_client is freed. A decoding or server bug can then find
and try to put that first nfs_client which would lead to a crash.
Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
Fixes: d6870312659d ("nfs4client: convert to idr_alloc()")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/nfs/nfs4client.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 28e1f211600d..cf8b0a4794dd 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -32,7 +32,7 @@ static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
return ret;
idr_preload(GFP_KERNEL);
spin_lock(&nn->nfs_client_lock);
- ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
+ ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
if (ret >= 0)
clp->cl_cb_ident = ret;
spin_unlock(&nn->nfs_client_lock);
--
2.6.4
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