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tpm: Check the bios_dir entry for NULL before accessing it

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Check the bios_dir entry for NULL before accessing it. Currently
this crashes the driver when a TPM 2 is attached and the entries
are NULL.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Stefan Berger 2016-11-16 08:56:13 -05:00 committed by Jarkko Sakkinen
parent 79eec5b940
commit 005451d44a
1 changed files with 7 additions and 5 deletions
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12
drivers/char/tpm/tpm_eventlog.c
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@ -449,10 +449,12 @@ void tpm_bios_log_teardown(struct tpm_chip *chip)
* This design ensures that open() either safely gets kref or fails.
*/
for (i = (TPM_NUM_EVENT_LOG_FILES - 1); i >= 0; i--) {
inode = d_inode(chip->bios_dir[i]);
inode_lock(inode);
inode->i_private = NULL;
inode_unlock(inode);
securityfs_remove(chip->bios_dir[i]);
if (chip->bios_dir[i]) {
inode = d_inode(chip->bios_dir[i]);
inode_lock(inode);
inode->i_private = NULL;
inode_unlock(inode);
securityfs_remove(chip->bios_dir[i]);
}
}
}