From: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>
commit a430e67d9a2c62a8c7b315b99e74de02018d0a96 upstream.
The priv->response_length can hold the size of an response or an negative
error code, and the tpm_common_read() needs to handle both cases correctly.
Changed the type of response_length to signed and accounted for negative
value in tpm_common_read().
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d23d12484307 ("tpm: fix invalid locking in NONBLOCKING mode")
Reported-by: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm-dev-common.c | 2 +-
drivers/char/tpm/tpm-dev.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/char/tpm/tpm-dev-common.c
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -130,7 +130,7 @@ ssize_t tpm_common_read(struct file *fil
priv->response_read = true;
ret_size = min_t(ssize_t, size, priv->response_length);
- if (!ret_size) {
+ if (ret_size <= 0) {
priv->response_length = 0;
goto out;
}
--- a/drivers/char/tpm/tpm-dev.h
+++ b/drivers/char/tpm/tpm-dev.h
@@ -14,7 +14,7 @@ struct file_priv {
struct work_struct timeout_work;
struct work_struct async_work;
wait_queue_head_t async_wait;
- size_t response_length;
+ ssize_t response_length;
bool response_read;
bool command_enqueued;
