commit 2ba0f41ef5e14d4b509c8854e27cf98e3ee89445
Author: Ingo Franzki <ifranzki@linux.ibm.com>
Date:   Mon Jul 10 13:22:48 2023 +0200

    p11sak: Fix parsing of slot number 0
    
    Running command 'p11sak list-key aes --slot 0' may result in
    'p11sak: Invalid argument '0' for option '-s/--slot''
    
    This is because of the error checking after strtoul() within function
    process_number_argument(). In case errno is not zero, it treats a
    parsed value of zero as an error.
    
    Under certain circumstances, errno is non-zero already before calling
    strtoul(), and stays non-zero in case of strtoul() succeeds. This leads to
    an incorrect error checking, and it is treated as error.
    
    Initialize errno to zero before calling strtoul() to avoid such false error
    detection.
    
    Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>

diff --git a/usr/sbin/p11sak/p11sak.c b/usr/sbin/p11sak/p11sak.c
index 6e11cb41..38665bbd 100644
--- a/usr/sbin/p11sak/p11sak.c
+++ b/usr/sbin/p11sak/p11sak.c
@@ -1712,6 +1712,7 @@ static CK_RV process_number_argument(const struct p11sak_arg *arg, char *val)
 {
     char *endptr;
 
+    errno = 0;
     *arg->value.number = strtoul(val, &endptr, 0);
 
     if ((errno == ERANGE && *arg->value.number == ULONG_MAX) ||