[PATCH 6.6 084/254] dmaengine: qcom: gpi: Fix memory leak in gpi_peripheral_config()

Greg Kroah-Hartman
2026-01-28T15:31:02Z

From: Miaoqian Lin <linmq006@gmail.com>

commit 3f747004bbd641131d9396d87b5d2d3d1e182728 upstream.

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>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://patch.msgid.link/20251029123421.91973-1-linmq006@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/dma/qcom/gpi.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/dma/qcom/gpi.c
+++ b/drivers/dma/qcom/gpi.c
@@ -1621,14 +1621,16 @@ 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;