tpm: add check for minimum buffer size in tpm_transmit()

tpm_transmit() does not check that bufsiz is at least TPM_HEADER_SIZE before accessing data. This commit adds this check and returns -EINVAL if it fails. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
mariux64 · Sep 15, 2016 · ebfd753 · ebfd753
1 parent 0014777
commit ebfd753
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
@@ -337,6 +337,9 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	u32 count, ordinal;
 	unsigned long stop;
 
+	if (bufsiz < TPM_HEADER_SIZE)
+		return -EINVAL;
+
 	if (bufsiz > TPM_BUFSIZE)
 		bufsiz = TPM_BUFSIZE;