[PATCH] nvmet: prevent double-free after metadata SGL allocation failure

[Avi Weiss]

If metadata SGL allocation fails, nvmet_req_alloc_sgls() frees
req->sg without clearing it. The RDMA error completion path later
frees the same scatterlist again.

Use nvmet_req_free_sgls() instead so that the scatterlist pointers
and counts are cleared before response cleanup.

Fixes: c6e3f13398123 ("nvmet: add metadata support for block devices")
Signed-off-by: Avi Weiss <thnkslprpt@xxxxxxxxx>
---
 drivers/nvme/target/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 07a74c2e1f58..8032924e657f 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1359,7 +1359,7 @@ int nvmet_req_alloc_sgls(struct nvmet_req *req)
 
 	return 0;
 out_free:
-	sgl_free(req->sg);
+	nvmet_req_free_sgls(req);
 out:
 	return -ENOMEM;
 }

base-commit: a804c5742bff224d4cb4d25dd383554d598be32b
-- 
2.43.0