Patch "nvme: Add error check for xa_store in nvme_get_effects_log" has been added to the 6.12-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    nvme: Add error check for xa_store in nvme_get_effects_log

to the 6.12-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:
     nvme-add-error-check-for-xa_store-in-nvme_get_effect.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 03689ef129fec3b609d099539a5ce6f9d341c46f
Author: Keisuke Nishimura <keisuke.nishimura@xxxxxxxx>
Date:   Fri Dec 20 13:00:47 2024 +0100

    nvme: Add error check for xa_store in nvme_get_effects_log
    
    [ Upstream commit ac32057acc7f3d7a238dafaa9b2aa2bc9750080e ]
    
    The xa_store() may fail due to memory allocation failure because there
    is no guarantee that the index csi is already used. This fix adds an
    error check of the return value of xa_store() in nvme_get_effects_log().
    
    Fixes: 1cf7a12e09aa ("nvme: use an xarray to lookup the Commands Supported and Effects log")
    Signed-off-by: Keisuke Nishimura <keisuke.nishimura@xxxxxxxx>
    Reviewed-by: Christoph Hellwig <hch@xxxxxx>
    Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
    Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 249914b90dbfa..f5ea15bfe6feb 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3085,7 +3085,7 @@ int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
 static int nvme_get_effects_log(struct nvme_ctrl *ctrl, u8 csi,
 				struct nvme_effects_log **log)
 {
-	struct nvme_effects_log	*cel = xa_load(&ctrl->cels, csi);
+	struct nvme_effects_log *old, *cel = xa_load(&ctrl->cels, csi);
 	int ret;
 
 	if (cel)
@@ -3102,7 +3102,11 @@ static int nvme_get_effects_log(struct nvme_ctrl *ctrl, u8 csi,
 		return ret;
 	}
 
-	xa_store(&ctrl->cels, csi, cel, GFP_KERNEL);
+	old = xa_store(&ctrl->cels, csi, cel, GFP_KERNEL);
+	if (xa_is_err(old)) {
+		kfree(cel);
+		return xa_err(old);
+	}
 out:
 	*log = cel;
 	return 0;