[PATCH] getdelim: ensure error indicator is set on error (bug 29917)

[Andreas Schwab]

POSIX requires that getdelim and getline set the error indicator on the
stream when an error occured, in addition to setting errno.
---
 libio/iogetdelim.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/libio/iogetdelim.c b/libio/iogetdelim.c
index b6c4c07b45..591526e9c1 100644
--- a/libio/iogetdelim.c
+++ b/libio/iogetdelim.c
@@ -43,11 +43,6 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
   ssize_t cur_len = 0;
   ssize_t len;
 
-  if (lineptr == NULL || n == NULL)
-    {
-      __set_errno (EINVAL);
-      return -1;
-    }
   CHECK_FILE (fp, -1);
   _IO_acquire_lock (fp);
   if (_IO_ferror_unlocked (fp))
@@ -56,12 +51,21 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
       goto unlock_return;
     }
 
+  if (lineptr == NULL || n == NULL)
+    {
+      __set_errno (EINVAL);
+      fseterr_unlocked (fp);
+      result = -1;
+      goto unlock_return;
+    }
+
   if (*lineptr == NULL || *n == 0)
     {
       *n = 120;
       *lineptr = (char *) malloc (*n);
       if (*lineptr == NULL)
 	{
+	  fseterr_unlocked (fp);
 	  result = -1;
 	  goto unlock_return;
 	}
@@ -88,6 +92,7 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
       if (__glibc_unlikely (len >= SSIZE_MAX - cur_len))
 	{
 	  __set_errno (EOVERFLOW);
+	  fseterr_unlocked (fp);
 	  result = -1;
 	  goto unlock_return;
 	}
@@ -102,6 +107,7 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
 	  new_lineptr = (char *) realloc (*lineptr, needed);
 	  if (new_lineptr == NULL)
 	    {
+	      fseterr_unlocked (fp);
 	      result = -1;
 	      goto unlock_return;
 	    }
-- 
2.39.0


-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."