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

[Andreas Schwab <schwab@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a09183aed7bb8ace211e042b2e6e982bcc004957

commit a09183aed7bb8ace211e042b2e6e982bcc004957
Author: Andreas Schwab <schwab@suse.de>
Date:   Mon Dec 19 12:40:45 2022 +0100

    getdelim: ensure error indicator is set on error (bug 29917)
    
    POSIX requires that getdelim and getline set the error indicator on the
    stream when an error occured, in addition to setting errno.

Diff:
---
 libio/Makefile       |  2 +-
 libio/iogetdelim.c   | 16 +++++++++++-----
 libio/tst-getdelim.c | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/libio/Makefile b/libio/Makefile
index 64398ab1ee..9c69a85c87 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -66,7 +66,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc   \
 	tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \
 	tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof \
 	tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051 tst-bz24153 \
-	tst-wfile-sync tst-bz28828
+	tst-wfile-sync tst-bz28828 tst-getdelim
 
 tests-internal = tst-vtables tst-vtables-interposed
 
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;
 	    }
diff --git a/libio/tst-getdelim.c b/libio/tst-getdelim.c
new file mode 100644
index 0000000000..4443732669
--- /dev/null
+++ b/libio/tst-getdelim.c
@@ -0,0 +1,36 @@
+/* Check that getdelim sets error indicator on error (BZ #29917)
+
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  clearerr (stdin);
+  TEST_VERIFY (getdelim (0, 0, '\n', stdin) == -1);
+  TEST_VERIFY (ferror (stdin) != 0);
+  TEST_VERIFY (errno == EINVAL);
+
+  return 0;
+}
+
+#include <support/test-driver.c>