This is a note to let you know that I've just added the patch titled
NFSD: Initialize struct nfsd4_copy earlier
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-initialize-struct-nfsd4_copy-earlier.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 99d6671cbed2cce39028a90463a177597deb5fc3
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Sat Oct 26 12:02:38 2024 -0400
NFSD: Initialize struct nfsd4_copy earlier
[ Upstream commit 63fab04cbd0f96191b6e5beedc3b643b01c15889 ]
Ensure the refcount and async_copies fields are initialized early.
cleanup_async_copy() will reference these fields if an error occurs
in nfsd4_copy(). If they are not correctly initialized, at the very
least, a refcount underflow occurs.
Reported-by: Olga Kornievskaia <okorniev@xxxxxxxxxx>
Fixes: aadc3bbea163 ("NFSD: Limit the number of concurrent async COPY operations")
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Tested-by: Olga Kornievskaia <okorniev@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 5768b2ff1d1d1..81a1e3bf06b97 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1838,14 +1838,14 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (!async_copy)
goto out_err;
async_copy->cp_nn = nn;
+ INIT_LIST_HEAD(&async_copy->copies);
+ refcount_set(&async_copy->refcount, 1);
/* Arbitrary cap on number of pending async copy operations */
if (atomic_inc_return(&nn->pending_async_copies) >
(int)rqstp->rq_pool->sp_nrthreads) {
atomic_dec(&nn->pending_async_copies);
goto out_err;
}
- INIT_LIST_HEAD(&async_copy->copies);
- refcount_set(&async_copy->refcount, 1);
async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
if (!async_copy->cp_src)
goto out_err;
