cxl/test: Zero out LSA backing memory to avoid leaking to user

Memory through vmalloc() is not zeroed out. When this memory is copied
into output payload, it leaks memory content to user. Use vzalloc()
instead to zero out the memory.

Suggested-by: sashiko-bot
Link: https://lore.kernel.org/linux-cxl/20260605173146.2B9A31F00893@smtp.kernel.org/
Fixes: 7d3eb23c4ccf ("tools/testing/cxl: Introduce a mock memory device + driver")
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260605184426.4070913-1-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 9a7cd3f46a1ee53f1f4d902132fdbd5274f302d8..739343cd58022abfaa7bdd83c04f386813c5e285 100644 (file)
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -1724,7 +1724,7 @@ static int cxl_mock_mem_probe(struct platform_device *pdev)
                return -ENOMEM;
        dev_set_drvdata(dev, mdata);
 
-       mdata->lsa = vmalloc(LSA_SIZE);
+       mdata->lsa = vzalloc(LSA_SIZE);
        if (!mdata->lsa)
                return -ENOMEM;
        mdata->fw = vmalloc(FW_SIZE);