linux-kernel - [RESEND PATCH] nvmem: core: add a missing of_node

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Message-Id: <20210611102321.11509-1-srinivas.kandagatla@linaro.org>
Date:   Fri, 11 Jun 2021 11:23:21 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        stable@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [RESEND PATCH] nvmem: core: add a missing of_node_put

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>

'for_each_child_of_node' performs an of_node_get on each iteration, so a
return from the middle of the loop requires an of_node_put.

Fixes: e888d445ac33 ("nvmem: resolve cells from DT at registration time")
Cc: <stable@...r.kernel.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
Hi Greg, 

Resending just this one with cc stable as rest of nvmem series are already applied.

thanks,
srini

 drivers/nvmem/core.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index b3c28a2d4c10..4868aa876e1b 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -686,15 +686,17 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
 			continue;
 		if (len < 2 * sizeof(u32)) {
 			dev_err(dev, "nvmem: invalid reg on %pOF\n", child);
+			of_node_put(child);
 			return -EINVAL;
 		}
 
 		cell = kzalloc(sizeof(*cell), GFP_KERNEL);
-		if (!cell)
+		if (!cell) {
+			of_node_put(child);
 			return -ENOMEM;
+		}
 
 		cell->nvmem = nvmem;
-		cell->np = of_node_get(child);
 		cell->offset = be32_to_cpup(addr++);
 		cell->bytes = be32_to_cpup(addr);
 		cell->name = kasprintf(GFP_KERNEL, "%pOFn", child);
@@ -715,11 +717,12 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
 				cell->name, nvmem->stride);
 			/* Cells already added will be freed later. */
 			kfree_const(cell->name);
-			of_node_put(cell->np);
 			kfree(cell);
+			of_node_put(child);
 			return -EINVAL;
 		}
 
+		cell->np = of_node_get(child);
 		nvmem_cell_add(cell);
 	}
 
-- 
2.21.0