ima: fix freeing ongoing ahash_request
integrity_kernel_read() can fail in which case we forward to call
ahash_request_free() on a currently running request. We have to wait
for its completion before we can free the request.
This was observed by interrupting a "find / -type f -xdev -print0 | xargs -0
cat 1>/dev/null" with ctrl-c on an IMA enabled filesystem.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 7532b06..73044fc 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -271,6 +271,11 @@ static int ima_calc_file_hash_atfm(struct file *file,
if (rc != rbuf_len) {
if (rc >= 0)
rc = -EINVAL;
+ /*
+ * Forward current rc, do not overwrite with return value
+ * from ahash_wait()
+ */
+ ahash_wait(ahash_rc, &wait);
goto out3;
}