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 <xiaopei01@kylinos.cn>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/d5f0b38d6d6c17c01519c879d26448dbae388b0e.1791015549.git.xiaopei01@kylinos.cn
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

0 files changed, 0 insertions, 0 deletions