tpm/tpm_i2c_stm_st33: Check return code of get_burstcount

commit 85c5e0d451125c6ddb78663972e40af810b83644 upstream.

The 'get_burstcount' function can in some circumstances 'return -EBUSY' which
in tpm_stm_i2c_send is stored in an 'u32 burstcnt'
thus converting the signed value into an unsigned value, resulting
in 'burstcnt' being huge.
Changing the type to u32 only does not solve the problem as the signed
value is converted to an unsigned in I2C_WRITE_DATA, resulting in the
same effect.

Thus
-> Change type of burstcnt to u32 (the return type of get_burstcount)
-> Add a check for the return value of 'get_burstcount' and propagate a
potential error.

This makes also sense in the 'I2C_READ_DATA' case, where the there is no
signed/unsigned conversion.

found by coverity
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 5bb8e2ddd3b3..156bd3c72770 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -410,6 +410,8 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
                              &chip->vendor.read_queue)
                == 0) {
                 burstcnt = get_burstcount(chip);
+                if (burstcnt < 0)
+                        return burstcnt;
                 len = min_t(int, burstcnt, count - size);
                 I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
                 size += len;
@@ -451,7 +453,8 @@ static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
 static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
                             size_t len)
 {
-        u32 status, burstcnt = 0, i, size;
+        u32 status, i, size;
+        int burstcnt = 0;
         int ret;
         u8 data;
         struct i2c_client *client;
@@ -482,6 +485,8 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
 
         for (i = 0; i < len - 1;) {
                 burstcnt = get_burstcount(chip);
+                if (burstcnt < 0)
+                        return burstcnt;
                 size = min_t(int, len - i - 1, burstcnt);
                 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
                 if (ret < 0)