[PATCH] dma: qcom: gpi: Fix memory leak in gpi_peripheral_config()

[Miaoqian Lin <linmq006@gmail.com>]

Fix a memory leak in gpi_peripheral_config() where the original memory
pointed to by gchan->config could be lost if krealloc() fails.

The issue occurs when:
1. gchan->config points to previously allocated memory
2. krealloc() fails and returns NULL
3. The function directly assigns NULL to gchan->config, losing the
   reference to the original memory
4. The original memory becomes unreachable and cannot be freed

Fix this by using a temporary variable to hold the krealloc() result
and only updating gchan->config when the allocation succeeds.

Found via static analysis and code review.

Fixes: 5d0c3533a19f ("dmaengine: qcom: Add GPI dma driver")
Cc: stable@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/dma/qcom/gpi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c
index 8e87738086b2..8908b7c71900 100644
--- a/drivers/dma/qcom/gpi.c
+++ b/drivers/dma/qcom/gpi.c
@@ -1605,14 +1605,16 @@ static int
 gpi_peripheral_config(struct dma_chan *chan, struct dma_slave_config *config)
 {
 	struct gchan *gchan = to_gchan(chan);
+	void *new_config;
 
 	if (!config->peripheral_config)
 		return -EINVAL;
 
-	gchan->config = krealloc(gchan->config, config->peripheral_size, GFP_NOWAIT);
-	if (!gchan->config)
+	new_config = krealloc(gchan->config, config->peripheral_size, GFP_NOWAIT);
+	if (!new_config)
 		return -ENOMEM;
 
+	gchan->config = new_config;
 	memcpy(gchan->config, config->peripheral_config, config->peripheral_size);
 
 	return 0;
-- 
2.39.5 (Apple Git-154)