File libtar-1.2.20-no-static-buffer.patch of Package libtar

Overview Repositories Revisions Requests Users Attributes Meta

File libtar-1.2.20-no-static-buffer.patch of Package libtar (Revision 1bcc13f6521dc4a135c3cc78a9d5101d)

Currently displaying revision 1bcc13f6521dc4a135c3cc78a9d5101d , Show latest

From ba16223652cfaa656d9c0c2d7bc7ab39dbd12467 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 23 Oct 2013 15:04:22 +0200
Subject: [PATCH 1/3] decode: avoid using a static buffer in th_get_pathname()

A solution suggested by Chris Frey:
https://lists.feep.net:8080/pipermail/libtar/2013-October/000377.html

Note this can break programs that expect sizeof(TAR) to be fixed.

[upstream commit ec613af2e9371d7a3e1f7c7a6822164a4255b4d1]
---
 lib/decode.c |   24 +++++++++++++++++-------
 lib/handle.c |    1 +
 lib/libtar.h |    3 +++
 3 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/lib/decode.c b/lib/decode.c
index c16ea2d..edb2185 100644
--- a/lib/decode.c
+++ b/lib/decode.c
@@ -26,20 +26,30 @@
 char *
 th_get_pathname(TAR *t)
 {
-	static TLS_THREAD char filename[MAXPATHLEN];
-
 	if (t->th_buf.gnu_longname)
 		return t->th_buf.gnu_longname;
 
-	if (t->th_buf.prefix[0] != '\0')
+	/* allocate the th_pathname buffer if not already */
+	if (t->th_pathname == NULL)
+	{
+		t->th_pathname = malloc(MAXPATHLEN * sizeof(char));
+		if (t->th_pathname == NULL)
+			/* out of memory */
+			return NULL;
+	}
+
+	if (t->th_buf.prefix[0] == '\0')
+	{
+		snprintf(t->th_pathname, MAXPATHLEN, "%.100s", t->th_buf.name);
+	}
+	else
 	{
-		snprintf(filename, sizeof(filename), "%.155s/%.100s",
+		snprintf(t->th_pathname, MAXPATHLEN, "%.155s/%.100s",
 			 t->th_buf.prefix, t->th_buf.name);
-		return filename;
 	}
 
-	snprintf(filename, sizeof(filename), "%.100s", t->th_buf.name);
-	return filename;
+	/* will be deallocated in tar_close() */
+	return t->th_pathname;
 }
 
 
diff --git a/lib/handle.c b/lib/handle.c
index 002d23c..a19c046 100644
--- a/lib/handle.c
+++ b/lib/handle.c
@@ -122,6 +122,7 @@ tar_close(TAR *t)
 		libtar_hash_free(t->h, ((t->oflags & O_ACCMODE) == O_RDONLY
 					? free
 					: (libtar_freefunc_t)tar_dev_free));
+	free(t->th_pathname);
 	free(t);
 
 	return i;
diff --git a/lib/libtar.h b/lib/libtar.h
index 7fc4d03..08a8e0f 100644
--- a/lib/libtar.h
+++ b/lib/libtar.h
@@ -85,6 +85,9 @@ typedef struct
 	int options;
 	struct tar_header th_buf;
 	libtar_hash_t *h;
+
+	/* introduced in libtar 1.2.21 */
+	char *th_pathname;
 }
 TAR;
 
-- 
1.7.1

From 8ef92e48bba35d60208cc09be2bab74f69273d15 Mon Sep 17 00:00:00 2001
From: Chris Frey <cdfrey@foursquare.net>
Date: Thu, 24 Oct 2013 17:55:12 -0400
Subject: [PATCH 2/3] Check for NULL before freeing th_pathname

Thanks to Harald Koch for pointing out that AIX 4 and 5 still need this.

[upstream commit 495d0c0eabc5648186e7d58ad54b508d14af38f4]

Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/handle.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/handle.c b/lib/handle.c
index a19c046..28a7dc2 100644
--- a/lib/handle.c
+++ b/lib/handle.c
@@ -122,7 +122,8 @@ tar_close(TAR *t)
 		libtar_hash_free(t->h, ((t->oflags & O_ACCMODE) == O_RDONLY
 					? free
 					: (libtar_freefunc_t)tar_dev_free));
-	free(t->th_pathname);
+	if (t->th_pathname != NULL)
+		free(t->th_pathname);
 	free(t);
 
 	return i;
-- 
1.7.1

From 71101392dbab09718d38fabd151bb3cf22fc8b80 Mon Sep 17 00:00:00 2001
From: Chris Frey <cdfrey@foursquare.net>
Date: Thu, 24 Oct 2013 17:58:47 -0400
Subject: [PATCH 3/3] Added stdlib.h for malloc() in lib/decode.c

[upstream commit 20aa09bd7775094a2beb0f136c2c7d9e9fd6c7e6]

Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/decode.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/lib/decode.c b/lib/decode.c
index edb2185..35312be 100644
--- a/lib/decode.c
+++ b/lib/decode.c
@@ -13,6 +13,7 @@
 #include <internal.h>
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/param.h>
 #include <pwd.h>
 #include <grp.h>
-- 
1.7.1

Places

File libtar-1.2.20-no-static-buffer.patch of Package libtar (Revision 1bcc13f6521dc4a135c3cc78a9d5101d)

Places