tpm: st33zp24: fix potential buffer overruns caused by bit glitches on the bus

[sfrench/cifs-2.6.git] / drivers / char / tpm / st33zp24 / st33zp24.c

diff --git a/drivers/char/tpm/st33zp24/st33zp24.c b/drivers/char/tpm/st33zp24/st33zp24.c
index 4d1dc8b46877ca497a198a3d988d060b9235100a..f95b9c75175bcf27825b16891ca405886e51c379 100644 (file)
--- a/drivers/char/tpm/st33zp24/st33zp24.c
+++ b/drivers/char/tpm/st33zp24/st33zp24.c
@@ -457,7 +457,7 @@ static int st33zp24_recv(struct tpm_chip *chip, unsigned char *buf,
                            size_t count)
 {
        int size = 0;
-       int expected;
+       u32 expected;
 
        if (!chip)
                return -EBUSY;
@@ -474,7 +474,7 @@ static int st33zp24_recv(struct tpm_chip *chip, unsigned char *buf,
        }
 
        expected = be32_to_cpu(*(__be32 *)(buf + 2));
-       if (expected > count) {
+       if (expected > count || expected < TPM_HEADER_SIZE) {
                size = -EIO;
                goto out;
        }