5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chuck Lever <chuck.lever@xxxxxxxxxx>
[ Upstream commit e5decb2eb5f4d1f64ba9196b4bad0e26a441c81c ]
When space in the Reply chunk runs out in the middle of a segment,
we end up passing a zero-length SGL to rdma_rw_ctx_init(), and it
oopses.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Stable-dep-of: ffc17e1479e8 ("platform/x86: dell-smbios: Fix error path in dell_smbios_init()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/sunrpc/xprtrdma/svc_rdma_rw.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 80a0c0e87590..7c50eddb8d3c 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -460,6 +460,8 @@ svc_rdma_build_writes(struct svc_rdma_write_info *info,
offset += info->wi_seg_off;
write_len = min(remaining, length - info->wi_seg_off);
+ if (!write_len)
+ goto out_overflow;
ctxt = svc_rdma_get_rw_ctxt(rdma,
(write_len >> PAGE_SHIFT) + 2);
if (!ctxt)
--
2.43.0
