drivers/char/tpm/tpm.c: fix error-path memory leak

tpm_register_hardware() leaks devname on an error path.

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11425

Reported-by: Daniel Marjamki <danielm77@spray.se>
Cc: Debora Velarde <debora@linux.vnet.ibm.com>
Cc: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Cc: Marcel Selhorst <tpm@selhorst.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index aa899ce..e70d13d 100644 (file)
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1187,11 +1187,8 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
        devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
 
-       if (chip == NULL || devname == NULL) {
-               kfree(chip);
-               kfree(devname);
-               return NULL;
-       }
+       if (chip == NULL || devname == NULL)
+               goto out_free;
 
        mutex_init(&chip->buffer_mutex);
        mutex_init(&chip->tpm_mutex);
@@ -1208,8 +1205,7 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
 
        if (chip->dev_num >= TPM_NUM_DEVICES) {
                dev_err(dev, "No available tpm device numbers\n");
-               kfree(chip);
-               return NULL;
+               goto out_free;
        } else if (chip->dev_num == 0)
                chip->vendor.miscdev.minor = TPM_MINOR;
        else
@@ -1250,6 +1246,11 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
        spin_unlock(&driver_lock);
 
        return chip;
+
+out_free:
+       kfree(chip);
+       kfree(devname);
+       return NULL;
 }
 EXPORT_SYMBOL_GPL(tpm_register_hardware);