5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jeff Layton jlayton@kernel.org
[ Upstream commit 15a8b55dbb1ba154d82627547c5761cac884d810 ]
For ops with "trivial" replies, nfsd4_encode_operation will shortcut most of the encoding work and skip to just marshalling up the status. One of the things it skips is calling op_release. This could cause a memory leak in the layoutget codepath if there is an error at an inopportune time.
Have the compound processing engine always call op_release, even when op_func sets an error in op->status. With this change, we also need nfsd4_block_get_device_info_scsi to set the gd_device pointer to NULL on error to avoid a double free.
Reported-by: Zhi Li yieli@redhat.com Link: https://bugzilla.redhat.com/show_bug.cgi?id=2181403 Fixes: 34b1744c91cc ("nfsd4: define ->op_release for compound ops") Signed-off-by: Jeff Layton jlayton@kernel.org [ cel: adjusted to apply to v5.15.y ] Signed-off-by: Chuck Lever chuck.lever@oracle.com --- fs/nfsd/nfs4xdr.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 9c9ff3bdc62a9..30c64c3f5fa05 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -5398,10 +5398,8 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) __be32 *p;
p = xdr_reserve_space(xdr, 8); - if (!p) { - WARN_ON_ONCE(1); - return; - } + if (!p) + goto release; *p++ = cpu_to_be32(op->opnum); post_err_offset = xdr->buf->len;
@@ -5416,8 +5414,6 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) op->status = encoder(resp, op->status, &op->u); if (op->status) trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); - if (opdesc && opdesc->op_release) - opdesc->op_release(&op->u); xdr_commit_encode(xdr);
/* nfsd4_check_resp_size guarantees enough room for error status */ @@ -5458,6 +5454,9 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) } status: *p = op->status; +release: + if (opdesc && opdesc->op_release) + opdesc->op_release(&op->u); }
/*