[glibc] adjtimex/adjtimex64: Use __nonnull to avoid null pointer

[glibc] adjtimex/adjtimex64: Use __nonnull to avoid null pointer

[Siddhesh Poyarekar]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d62a70fda8c7d772191ca8781dca46714efdd8cc

commit d62a70fda8c7d772191ca8781dca46714efdd8cc
Author: Xiaoming Ni <nixiaoming@huawei.com>
Date:   Thu May 5 11:01:08 2022 +0800

    adjtimex/adjtimex64: Use __nonnull to avoid null pointer
    
    Add __nonnull((1)) to the adjtimex()/adjtimex64() function declaration
        to avoid null pointer access.
    
    Link: https://sourceware.org/bugzilla/show_bug.cgi?id=27662
    Link: https://sourceware.org/bugzilla/show_bug.cgi?id=29084
    Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
    Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

Diff:
---
 sysdeps/unix/sysv/linux/include/sys/timex.h | 4 ++--
 sysdeps/unix/sysv/linux/sys/timex.h         | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/include/sys/timex.h b/sysdeps/unix/sysv/linux/include/sys/timex.h
index 964a2c21f2..dd599b1c32 100644
--- a/sysdeps/unix/sysv/linux/include/sys/timex.h
+++ b/sysdeps/unix/sysv/linux/include/sys/timex.h
@@ -23,7 +23,7 @@
 
 # ifndef _ISOMAC
 
-extern int __adjtimex (struct timex *__ntx);
+extern int __adjtimex (struct timex *__ntx) __nonnull ((1));
 libc_hidden_proto (__adjtimex)
 
 #  include <time.h>
@@ -79,7 +79,7 @@ struct __timex64
 };
 extern int __clock_adjtime64 (const clockid_t clock_id, struct __timex64 *tx64);
 libc_hidden_proto (__clock_adjtime64);
-extern int ___adjtimex64 (struct __timex64 *tx64);
+extern int ___adjtimex64 (struct __timex64 *tx64) __nonnull ((1));
 libc_hidden_proto (___adjtimex64)
 
 struct __ntptimeval64
diff --git a/sysdeps/unix/sysv/linux/sys/timex.h b/sysdeps/unix/sysv/linux/sys/timex.h
index 60d94814e8..430e47509d 100644
--- a/sysdeps/unix/sysv/linux/sys/timex.h
+++ b/sysdeps/unix/sysv/linux/sys/timex.h
@@ -55,7 +55,7 @@ struct ntptimeval
 __BEGIN_DECLS
 
 #ifndef __USE_TIME_BITS64
-extern int adjtimex (struct timex *__ntx) __THROW;
+extern int adjtimex (struct timex *__ntx) __THROW __nonnull ((1));
 extern int ntp_gettimex (struct ntptimeval *__ntv) __THROW;
 
 # ifdef __REDIRECT_NTH
@@ -68,7 +68,7 @@ extern int ntp_adjtime (struct timex *__tntx) __THROW;
 #else
 # ifdef __REDIRECT_NTH
 extern int __REDIRECT_NTH (adjtimex, (struct timex *__ntx),
-                           ___adjtimex64);
+                           ___adjtimex64) __nonnull ((1));
 extern int __REDIRECT_NTH (ntp_gettime, (struct ntptimeval *__ntv),
                            __ntp_gettime64);
 extern int __REDIRECT_NTH (ntp_gettimex, (struct ntptimeval *__ntv),