From 1900449684cf71427a51e0bb1d7914c0c8b39152 Mon Sep 17 00:00:00 2001 From: Pei Xiao Date: Sat, 3 Oct 2026 16:27:52 +0800 Subject: [PATCH] tpm: tpm_nsc: fix NULL pointer dereference on init failure tpm_nsc_remove() is used as the release callback of the hand-created platform device and dereferences the chip drvdata unconditionally. If init fails before tpmm_chip_alloc() (e.g. request_region() cannot claim the ports), the error path drops the last device reference and the release callback runs with chip == NULL, crashing module init. Return early when the chip has not been created yet. Cc: stable@vger.kernel.org Fixes: afb5abc262e9 ("tpm: two-phase chip management functions") Assisted-by: GLM-5.3 Signed-off-by: Pei Xiao Reviewed-by: Jarkko Sakkinen Link: https://lore.kernel.org/r/d5f0b38d6d6c17c01519c879d26448dbae388b0e.1791015549.git.xiaopei01@kylinos.cn Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm_nsc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c index 879ac88f5783..46a52dc99b14 100644 --- a/drivers/char/tpm/tpm_nsc.c +++ b/drivers/char/tpm/tpm_nsc.c @@ -259,7 +259,12 @@ static struct platform_device *pdev = NULL; static void tpm_nsc_remove(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); - struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + struct tpm_nsc_priv *priv; + + if (!chip) + return; + + priv = dev_get_drvdata(&chip->dev); tpm_chip_unregister(chip); release_region(priv->base, 2);