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-rw-r--r--sysdeps/generic/_strerror.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/generic/_strerror.c b/sysdeps/generic/_strerror.c
index 53ff9343e1..4a9b032c86 100644
--- a/sysdeps/generic/_strerror.c
+++ b/sysdeps/generic/_strerror.c
@@ -40,7 +40,7 @@
 char *
 __strerror_r (int errnum, char *buf, size_t buflen)
 {
-  if (errnum < 0 || errnum >= _sys_nerr)
+  if (errnum < 0 || errnum >= _sys_nerr || _sys_errlist[errnum] == NULL)
     {
       /* Buffer we use to print the number in.  For a maximum size for
 	 `int' of 8 bytes we never need more than 20 digits.  */