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tpm: Handle negative priv->response_len in tpm_common_read()

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commit a430e67d9a 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@vger.kernel.org
Fixes: d23d124843 ("tpm: fix invalid locking in NONBLOCKING mode")
Reported-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tadeusz Struk
2020-01-07 14:04:48 -08:00
committed by Greg Kroah-Hartman
parent 2e1a0a118a
commit 18c3955323
2 changed files with 2 additions and 2 deletions
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2
drivers/char/tpm/tpm-dev-common.c
View File

@@ -130,7 +130,7 @@ ssize_t tpm_common_read(struct file *file, char __user *buf,
priv->response_read = true; priv->response_read = true;
ret_size = min_t(ssize_t, size, priv->response_length); ret_size = min_t(ssize_t, size, priv->response_length);
if (!ret_size) { if (ret_size <= 0) {
priv->response_length = 0; priv->response_length = 0;
goto out; goto out;
} }

2
drivers/char/tpm/tpm-dev.h
View File

@@ -14,7 +14,7 @@ struct file_priv {
struct work_struct timeout_work; struct work_struct timeout_work;
struct work_struct async_work; struct work_struct async_work;
wait_queue_head_t async_wait; wait_queue_head_t async_wait;
size_t response_length; ssize_t response_length;
bool response_read; bool response_read;
bool command_enqueued; bool command_enqueued;