From: Florian Weimer <fweimer@redhat.com>
To: libc-alpha@sourceware.org
Subject: [PATCH 3/5] resolv: Fix file handle leak in __resolv_conf_load [BZ #25429]
Date: Tue, 21 Jan 2020 18:42:00 -0000 [thread overview]
Message-ID: <4d8628bf1d8630c16de30d47732058ec82293429.1579631655.git.fweimer@redhat.com> (raw)
In-Reply-To: <cover.1579631655.git.fweimer@redhat.com>
res_vinit_1 did not close the stream on errors, only on success.
This change moves closing the stream to __resolv_conf_load, for both
the success and error cases.
Fixes commit 89f187a40fc0ad4e22838526bfe34d73f758b776 ("resolv: Use
getline for configuration file reading in res_vinit_1") and commit
3f853f22c87f0b671c0366eb290919719fa56c0e ("resolv: Lift domain search
list limits [BZ #19569] [BZ #21475]"), where memory allocation was
introduced into res_vinit_1.
---
resolv/res_init.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/resolv/res_init.c b/resolv/res_init.c
index 95dce098aa..09345718cd 100644
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -508,7 +508,6 @@ res_vinit_1 (FILE *fp, struct resolv_conf_parser *parser)
continue;
}
}
- fclose (fp);
}
if (__glibc_unlikely (nameserver_list_size (&parser->nameserver_list) == 0))
{
@@ -593,6 +592,13 @@ __resolv_conf_load (struct __res_state *preinit)
}
resolv_conf_parser_free (&parser);
+ if (fp != NULL)
+ {
+ int saved_errno = errno;
+ fclose (fp);
+ __set_errno (saved_errno);
+ }
+
return conf;
}
--
2.24.1
next prev parent reply other threads:[~2020-01-21 18:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-21 18:41 [PATCH 0/5] Race condition in /etc/resolv.conf reloading (bug 25420) Florian Weimer
2020-01-21 18:41 ` [PATCH 1/5] Add internal <file_change_detection.h> header file Florian Weimer
2020-02-10 19:47 ` Adhemerval Zanella
2020-02-10 19:58 ` Florian Weimer
2020-02-10 20:57 ` Adhemerval Zanella
2020-01-21 18:42 ` [PATCH 2/5] resolv: Use <file_change_detection.h> in __resolv_conf_get_current Florian Weimer
2020-02-13 20:53 ` Adhemerval Zanella
2020-01-21 18:42 ` Florian Weimer [this message]
2020-02-13 21:01 ` [PATCH 3/5] resolv: Fix file handle leak in __resolv_conf_load [BZ #25429] Adhemerval Zanella
2020-02-13 21:08 ` Florian Weimer
2020-02-13 21:30 ` Adhemerval Zanella
2020-01-21 18:42 ` [PATCH 4/5] resolv: Enhance __resolv_conf_load to capture file change data Florian Weimer
2020-02-13 21:33 ` Adhemerval Zanella
2020-01-21 21:28 ` [PATCH 5/5] resolv: Fix ABA race in /etc/resolv.conf change detection [BZ #25420] Florian Weimer
2020-02-13 21:59 ` Adhemerval Zanella
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