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From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
To: linux-mtd@lists.infradead.org
Cc: richard@nod.at, David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Subject: [PATCH 02/15] mkfs.ubifs: don't leak copied command line arguments
Date: Sun, 10 Nov 2019 16:30:46 +0100
Message-ID: <20191110153059.28878-3-david.oberhollenzer@sigma-star.at> (raw)
In-Reply-To: <20191110153059.28878-1-david.oberhollenzer@sigma-star.at>

For some command line flags, the argument string is copied. Simply
writing over the buffer leads to a resource leak if the same flag
is specified on the command line more than once.

This patch adds a free() call to the old buffer before overwriting
it with the new copy.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 ubifs-utils/mkfs.ubifs/mkfs.ubifs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ubifs-utils/mkfs.ubifs/mkfs.ubifs.c b/ubifs-utils/mkfs.ubifs/mkfs.ubifs.c
index bf1290f..ea0afee 100644
--- a/ubifs-utils/mkfs.ubifs/mkfs.ubifs.c
+++ b/ubifs-utils/mkfs.ubifs/mkfs.ubifs.c
@@ -580,6 +580,7 @@ static int get_options(int argc, char**argv)
 		switch (opt) {
 		case 'r':
 		case 'd':
+			free(root);
 			root_len = strlen(optarg);
 			root = xmalloc(root_len + 2);
 
@@ -726,6 +727,7 @@ static int get_options(int argc, char**argv)
 			do_create_inum_attr = 1;
 			break;
 		case 's':
+			free(context);
 			context_len = strlen(optarg);
 			context = (char *) xmalloc(context_len + 1);
 			if (!context)
-- 
2.21.0


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Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-10 15:30 [PATCH 00/15] mtd-utils: cleanup resource leaks David Oberhollenzer
2019-11-10 15:30 ` [PATCH 01/15] mkfs.ubifs: close file descriptor in add_file error path David Oberhollenzer
2019-11-10 15:30 ` David Oberhollenzer [this message]
2019-11-10 15:30 ` [PATCH 03/15] mkfs.ubifs: free derived fscrypt context in add_directory error paths David Oberhollenzer
2019-11-10 15:30 ` [PATCH 04/15] mkfs.ubifs: don't leak hastable iterators David Oberhollenzer
2019-11-10 15:30 ` [PATCH 05/15] mkfs.ubifs: don't leak temporary buffers David Oberhollenzer
2019-11-10 15:30 ` [PATCH 06/15] mkfs.ubifs: propperly cleanup in ALL interpret_table_entry error paths David Oberhollenzer
2019-11-10 15:30 ` [PATCH 07/15] mkfs.jffs2: don't leak temporary buffer if readlink fails David Oberhollenzer
2019-11-10 15:30 ` [PATCH 08/15] libmtd: don't leak temporary buffers David Oberhollenzer
2019-11-10 15:30 ` [PATCH 09/15] ftl_check: " David Oberhollenzer
2019-11-10 15:30 ` [PATCH 10/15] ftl_format: " David Oberhollenzer
2019-11-10 15:30 ` [PATCH 11/15] ubiformat: don't leak file descriptors David Oberhollenzer
2019-11-10 15:30 ` [PATCH 12/15] nanddump: don't leak copied command line arguments David Oberhollenzer
2019-11-10 15:30 ` [PATCH 13/15] mtd_debug: cleanup error handling in flash_to_file David Oberhollenzer
2019-11-10 15:30 ` [PATCH 14/15] jittertest: fix error check for open system call David Oberhollenzer
2019-11-10 15:30 ` [PATCH 15/15] fs-tests: don't leak temporary buffers David Oberhollenzer

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