From 3eb91c2e3594f379f357bfcc85105b6b76a11781 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Tue, 21 Nov 2006 00:55:46 +0000
Subject: cpio: (allegedly) fix bug 0001095: "cpio hardlink support and
possible memory leak fix"
---
archival/libunarchive/get_header_cpio.c | 93 +++++++++++++++++++--------------
archival/libunarchive/init_handle.c | 2 +-
2 files changed, 55 insertions(+), 40 deletions(-)
diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c
index dd48cb09b..f0b07b56c 100644
--- a/archival/libunarchive/get_header_cpio.c
+++ b/archival/libunarchive/get_header_cpio.c
@@ -8,7 +8,7 @@
#include "unarchive.h"
typedef struct hardlinks_s {
- file_header_t *entry;
+ char *name;
int inode;
struct hardlinks_s *next;
} hardlinks_t;
@@ -17,46 +17,66 @@ char get_header_cpio(archive_handle_t *archive_handle)
{
static hardlinks_t *saved_hardlinks = NULL;
static unsigned short pending_hardlinks = 0;
+ static int inode;
file_header_t *file_header = archive_handle->file_header;
char cpio_header[110];
int namesize;
char dummy[16];
- int major, minor, nlink, inode;
+ int major, minor, nlink;
if (pending_hardlinks) { /* Deal with any pending hardlinks */
- hardlinks_t *tmp;
- hardlinks_t *oldtmp;
+ hardlinks_t *tmp, *oldtmp;
tmp = saved_hardlinks;
oldtmp = NULL;
+ file_header->link_name = file_header->name;
+ file_header->size = 0;
+
while (tmp) {
- bb_error_msg_and_die("need to fix this");
- if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
- file_header = tmp->entry;
- if (oldtmp) {
- oldtmp->next = tmp->next; /* Remove item from linked list */
- } else {
- saved_hardlinks = tmp->next;
- }
- free(tmp);
+ if (tmp->inode != inode) {
+ tmp = tmp->next;
continue;
}
+
+ file_header->name = tmp->name;
+
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ archive_handle->action_data(archive_handle);
+ archive_handle->action_header(archive_handle->file_header);
+ }
+
+ pending_hardlinks--;
+
oldtmp = tmp;
tmp = tmp->next;
+ free(oldtmp->name);
+ free(oldtmp);
+ if (oldtmp == saved_hardlinks)
+ saved_hardlinks = tmp;
+ }
+
+ file_header->name = file_header->link_name;
+
+ if (pending_hardlinks > 1) {
+ bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?");
}
- pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
+
+ /* No more pending hardlinks, read next file entry */
+ pending_hardlinks = 0;
}
/* There can be padding before archive header */
data_align(archive_handle, 4);
if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
- return(EXIT_FAILURE);
+ return EXIT_FAILURE;
}
archive_handle->offset += 110;
- if ((strncmp(&cpio_header[0], "07070", 5) != 0) || ((cpio_header[5] != '1') && (cpio_header[5] != '2'))) {
+ if (strncmp(&cpio_header[0], "07070", 5) != 0
+ || (cpio_header[5] != '1' && cpio_header[5] != '2')
+ ) {
bb_error_msg_and_die("unsupported cpio format, use newc or crc");
}
@@ -70,7 +90,8 @@ char get_header_cpio(archive_handle_t *archive_handle)
file_header->size = tmpsize;
}
- file_header->name = (char *) xzalloc(namesize + 1);
+ free(file_header->name);
+ file_header->name = xzalloc(namesize + 1);
/* Read in filename */
xread(archive_handle->src_fd, file_header->name, namesize);
archive_handle->offset += namesize;
@@ -79,26 +100,29 @@ char get_header_cpio(archive_handle_t *archive_handle)
data_align(archive_handle, 4);
if (strcmp(file_header->name, "TRAILER!!!") == 0) {
- printf("%d blocks\n", (int) (archive_handle->offset % 512 ? (archive_handle->offset / 512) + 1 : archive_handle->offset / 512)); /* Always round up */
+ /* Always round up */
+ printf("%d blocks\n", (int) (archive_handle->offset % 512 ?
+ archive_handle->offset / 512 + 1 :
+ archive_handle->offset / 512
+ ));
if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
hardlinks_t *tmp = saved_hardlinks;
hardlinks_t *oldtmp = NULL;
while (tmp) {
- bb_error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
+ bb_error_msg("%s not created: cannot resolve hardlink", tmp->name);
oldtmp = tmp;
tmp = tmp->next;
- free (oldtmp->entry->name);
- free (oldtmp->entry);
- free (oldtmp);
+ free(oldtmp->name);
+ free(oldtmp);
}
saved_hardlinks = NULL;
pending_hardlinks = 0;
}
- return(EXIT_FAILURE);
+ return EXIT_FAILURE;
}
if (S_ISLNK(file_header->mode)) {
- file_header->link_name = (char *) xzalloc(file_header->size + 1);
+ file_header->link_name = xzalloc(file_header->size + 1);
xread(archive_handle->src_fd, file_header->link_name, file_header->size);
archive_handle->offset += file_header->size;
file_header->size = 0; /* Stop possible seeks in future */
@@ -110,23 +134,14 @@ char get_header_cpio(archive_handle_t *archive_handle)
hardlinks_t *new = xmalloc(sizeof(hardlinks_t));
new->next = saved_hardlinks;
new->inode = inode;
- new->entry = file_header;
+ /* name current allocated, freed later */
+ new->name = file_header->name;
+ file_header->name = NULL;
saved_hardlinks = new;
- return(EXIT_SUCCESS); // Skip this one
- } else { /* Found the file with data in */
- hardlinks_t *tmp = saved_hardlinks;
- pending_hardlinks = 1;
- while (tmp) {
- if (tmp->inode == inode) {
- tmp->entry->link_name = xstrdup(file_header->name);
- nlink--;
- }
- tmp = tmp->next;
- }
- if (nlink > 1) {
- bb_error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
- }
+ return EXIT_SUCCESS; /* Skip this one */
}
+ /* Found the file with data in */
+ pending_hardlinks = nlink;
}
file_header->device = makedev(major, minor);
diff --git a/archival/libunarchive/init_handle.c b/archival/libunarchive/init_handle.c
index 06e8d1fab..309d329ea 100644
--- a/archival/libunarchive/init_handle.c
+++ b/archival/libunarchive/init_handle.c
@@ -12,7 +12,7 @@ archive_handle_t *init_handle(void)
/* Initialize default values */
archive_handle = xzalloc(sizeof(archive_handle_t));
- archive_handle->file_header = xmalloc(sizeof(file_header_t));
+ archive_handle->file_header = xzalloc(sizeof(file_header_t));
archive_handle->action_header = header_skip;
archive_handle->action_data = data_skip;
archive_handle->filter = filter_accept_all;
--
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