On Tue, Apr 01, 2025 at 06:16:02PM +0800, Henry Martin wrote:

devm_kasprintf() returns NULL when memory allocation fails. Currently, uio_fsl_elbc_gpcm_probe() does not check for this case, which results in a NULL pointer dereference.

Add NULL check after devm_kasprintf() to prevent this issue and ensuring no resources are left allocated.

Cc: stable@vger.kernel.org Fixes: d57801c45f53 ("uio: uio_fsl_elbc_gpcm: use device-managed allocators") Signed-off-by: Henry Martin bsdhenrymartin@gmail.com

---

V2 -> V3: Add Cc: stable@vger.kernel.org V1 -> V2: Remove printk after memory failure and add proper resource cleanup.

drivers/uio/uio_fsl_elbc_gpcm.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/drivers/uio/uio_fsl_elbc_gpcm.c b/drivers/uio/uio_fsl_elbc_gpcm.c index 81454c3e2484..26be556d956c 100644 --- a/drivers/uio/uio_fsl_elbc_gpcm.c +++ b/drivers/uio/uio_fsl_elbc_gpcm.c @@ -384,6 +384,10 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev) /* set all UIO data */ info->mem[0].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", node);

• if (!info->mem[0].name) {

• ret = -ENOMEM;
  

• goto out_err3;
  

• } info->mem[0].addr = res.start; info->mem[0].size = resource_size(&res); info->mem[0].memtype = UIO_MEM_PHYS;

@@ -423,6 +427,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev) out_err2: if (priv->shutdown) priv->shutdown(info, true); +out_err3: iounmap(info->mem[0].internal_addr); return ret; } -- 2.34.1

How was this tested?