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From: Sven Eckelmann <sven@narfation.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Cc: Sven Eckelmann <sven@narfation.org>
Subject: [B.A.T.M.A.N.] [PATCH 4/6] batctl: Return success only with valid line_ptr in read_file
Date: Sat, 24 May 2014 14:16:42 +0200	[thread overview]
Message-ID: <1400933804-9661-4-git-send-email-sven@narfation.org> (raw)
In-Reply-To: <1400933804-9661-1-git-send-email-sven@narfation.org>

The read_file function is rather complex and cluttered with different
functionality. One of it is to provide a line_ptr of a single line to the
caller. The caller trusts the return code for a SUCCESS of this function
and tries to access the line_ptr. But a failed getline may lead to an
NULL-line_ptr. The caller tries to dereference this NULL pointer and
causes an segfault.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 functions.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/functions.c b/functions.c
index 84f0d14..251e616 100644
--- a/functions.c
+++ b/functions.c
@@ -320,7 +320,8 @@ written:
 		goto open;
 	}
 
-	res = EXIT_SUCCESS;
+	if (line_ptr)
+		res = EXIT_SUCCESS;
 
 out:
 	if (fp)
-- 
2.0.0.rc2


  parent reply	other threads:[~2014-05-24 12:16 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-24 12:16 [B.A.T.M.A.N.] [PATCH 1/6] batctl: Don't try to close negative file descriptors Sven Eckelmann
2014-05-24 12:16 ` [B.A.T.M.A.N.] [PATCH 2/6] batctl: Force null termination of string after strncpy Sven Eckelmann
2014-06-10 14:41   ` Marek Lindner
2014-05-24 12:16 ` [B.A.T.M.A.N.] [PATCH 3/6] batctl: Use strncpy instead of strcpy for string copy Sven Eckelmann
2014-06-10 14:49   ` Marek Lindner
2014-05-24 12:16 ` Sven Eckelmann [this message]
2014-06-10 14:53   ` [B.A.T.M.A.N.] [PATCH 4/6] batctl: Return success only with valid line_ptr in read_file Marek Lindner
2014-05-24 12:16 ` [B.A.T.M.A.N.] [PATCH 5/6] batctl: Initialize complete ping packet before write Sven Eckelmann
2014-06-10 14:58   ` Marek Lindner
2014-05-24 12:16 ` [B.A.T.M.A.N.] [PATCH 6/6] batctl: Don't provide uninitialized parameter to read_file Sven Eckelmann
2014-06-10 14:59   ` Marek Lindner
2014-06-10 14:31 ` [B.A.T.M.A.N.] [PATCH 1/6] batctl: Don't try to close negative file descriptors Marek Lindner

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