[PATCH] char: tpm: fix potential null pointer dereference

[Gustavo A. R. Silva]

NULL check at line 376: if (!chip) {, implies chip might be NULL.
Function dev_get_drvdata() dereference pointer chip.
Move pointer tmp_dev assignment after the NULL check.

Addresses-Coverity-ID: 1397648
Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
 drivers/char/tpm/st33zp24/st33zp24.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c 
b/drivers/char/tpm/st33zp24/st33zp24.c
index 4d1dc8b..f45e8c7 100644
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -367,7 +367,7 @@ static irqreturn_t tpm_ioserirq_handler(int irq, void 
*dev_id)
 static int st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
                         size_t len)
 {
-       struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
+       struct st33zp24_dev *tpm_dev;
        u32 status, i, size, ordinal;
        int burstcnt = 0;
        int ret;
@@ -382,6 +382,7 @@ static int st33zp24_send(struct tpm_chip *chip, unsigned 
char *buf,
        if (ret < 0)
                return ret;
 
+       tpm_dev = dev_get_drvdata(&chip->dev);
        status = st33zp24_status(chip);
        if ((status & TPM_STS_COMMAND_READY) == 0) {
                st33zp24_cancel(chip);
-- 
2.5.0