[PATCH 05/12] s390: zcrypt: initialize variables before_use

Arnd Bergmann
2019-04-08T21:26:18Z

The 'func_code' variable gets printed in debug statements without
a prior initialization in multiple functions, as reported when building
with clang:

drivers/s390/crypto/zcrypt_api.c:659:6: warning: variable 'func_code' is used uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
if (mex->outputdatalength < mex->inputdatalength) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/s390/crypto/zcrypt_api.c:725:29: note: uninitialized use occurs here
trace_s390_zcrypt_rep(mex, func_code, rc,
^~~~~~~~~
drivers/s390/crypto/zcrypt_api.c:659:2: note: remove the 'if' if its condition is always false
if (mex->outputdatalength < mex->inputdatalength) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/s390/crypto/zcrypt_api.c:654:24: note: initialize the variable 'func_code' to silence this warning
unsigned int func_code;
^

Add initializations to all affected code paths to shut up the warning
and make the warning output consistent.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/s390/crypto/zcrypt_api.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index eb93c2d27d0a..23472063d9a8 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -657,6 +657,7 @@ static long zcrypt_rsa_modexpo(struct ap_perms *perms,
trace_s390_zcrypt_req(mex, TP_ICARSAMODEXPO);

if (mex->outputdatalength < mex->inputdatalength) {
+ func_code = -1;
rc = -EINVAL;
goto out;
}
@@ -739,6 +740,7 @@ static long zcrypt_rsa_crt(struct ap_perms *perms,
trace_s390_zcrypt_req(crt, TP_ICARSACRT);

if (crt->outputdatalength < crt->inputdatalength) {
+ func_code = -1;
rc = -EINVAL;
goto out;
}
@@ -946,6 +948,7 @@ static long zcrypt_send_ep11_cprb(struct ap_perms *perms,

targets = kcalloc(target_num, sizeof(*targets), GFP_KERNEL);
if (!targets) {
+ func_code = -1;
rc = -ENOMEM;
goto out;
}
@@ -953,6 +956,7 @@ static long zcrypt_send_ep11_cprb(struct ap_perms *perms,
uptr = (struct ep11_target_dev __force __user *) xcrb->targets;
if (copy_from_user(targets, uptr,
target_num * sizeof(*targets))) {
+ func_code = -1;
rc = -EFAULT;
goto out_free;
}
--
2.20.0