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-rw-r--r--bin/rdsquashfs/describe.c8
-rw-r--r--bin/rdsquashfs/fill_files.c7
-rw-r--r--bin/rdsquashfs/rdsquashfs.c4
-rw-r--r--bin/rdsquashfs/restore_fstree.c15
-rw-r--r--bin/sqfs2tar/write_tree.c6
-rw-r--r--bin/sqfsdiff/node_compare.c7
-rw-r--r--bin/sqfsdiff/util.c8
-rw-r--r--include/sqfs/dir_reader.h14
-rw-r--r--lib/common/hardlink.c10
-rw-r--r--lib/sqfs/dir_reader/get_path.c73
10 files changed, 106 insertions, 46 deletions
diff --git a/bin/rdsquashfs/describe.c b/bin/rdsquashfs/describe.c
index 1e723bc..540b126 100644
--- a/bin/rdsquashfs/describe.c
+++ b/bin/rdsquashfs/describe.c
@@ -8,10 +8,12 @@
static int print_name(const sqfs_tree_node_t *n, bool dont_escape)
{
- char *start, *ptr, *name = sqfs_tree_node_get_path(n);
+ char *start, *ptr, *name;
+ int ret;
- if (name == NULL) {
- perror("Recovering file path of tree node");
+ ret = sqfs_tree_node_get_path(n, &name);
+ if (ret != 0) {
+ sqfs_perror(NULL, "Recovering file path of tree node", ret);
return -1;
}
diff --git a/bin/rdsquashfs/fill_files.c b/bin/rdsquashfs/fill_files.c
index 8459c1e..923bc12 100644
--- a/bin/rdsquashfs/fill_files.c
+++ b/bin/rdsquashfs/fill_files.c
@@ -67,6 +67,7 @@ static int add_file(const sqfs_tree_node_t *node)
struct file_ent *new;
size_t new_sz;
char *path;
+ int ret;
if (num_files == max_files) {
new_sz = max_files ? max_files * 2 : 256;
@@ -81,9 +82,9 @@ static int add_file(const sqfs_tree_node_t *node)
max_files = new_sz;
}
- path = sqfs_tree_node_get_path(node);
- if (path == NULL) {
- perror("assembling file path");
+ ret = sqfs_tree_node_get_path(node, &path);
+ if (ret != 0) {
+ sqfs_perror(NULL, "assembling file path", ret);
return -1;
}
diff --git a/bin/rdsquashfs/rdsquashfs.c b/bin/rdsquashfs/rdsquashfs.c
index a8dc4c9..8926df6 100644
--- a/bin/rdsquashfs/rdsquashfs.c
+++ b/bin/rdsquashfs/rdsquashfs.c
@@ -71,7 +71,9 @@ static int tree_sort(sqfs_tree_node_t *root)
for (it = root->children; it->next != NULL; it = it->next) {
if (strcmp((const char *)it->name,
(const char *)it->next->name) == 0) {
- char *path = sqfs_tree_node_get_path(it);
+ char *path;
+
+ sqfs_tree_node_get_path(it, &path);
fprintf(stderr, "Entry '%s' found more than once!\n",
path);
diff --git a/bin/rdsquashfs/restore_fstree.c b/bin/rdsquashfs/restore_fstree.c
index cf5bc2a..b9f92fe 100644
--- a/bin/rdsquashfs/restore_fstree.c
+++ b/bin/rdsquashfs/restore_fstree.c
@@ -127,10 +127,10 @@ static int create_node_dfs(const sqfs_tree_node_t *n, int flags)
return 0;
}
- name = sqfs_tree_node_get_path(n);
- if (name == NULL) {
- fprintf(stderr, "Constructing full path for '%s': %s\n",
- (const char *)n->name, strerror(errno));
+ ret = sqfs_tree_node_get_path(n, &name);
+ if (ret != 0) {
+ sqfs_perror((const char *)n->name,
+ "constructing full path", ret);
return -1;
}
@@ -226,10 +226,9 @@ static int set_attribs(sqfs_xattr_reader_t *xattr,
}
}
- path = sqfs_tree_node_get_path(n);
- if (path == NULL) {
- fprintf(stderr, "Reconstructing full path: %s\n",
- strerror(errno));
+ ret = sqfs_tree_node_get_path(n, &path);
+ if (ret != 0) {
+ sqfs_perror(NULL, "reconstructing full path", ret);
return -1;
}
diff --git a/bin/sqfs2tar/write_tree.c b/bin/sqfs2tar/write_tree.c
index d4f8366..1c19a5a 100644
--- a/bin/sqfs2tar/write_tree.c
+++ b/bin/sqfs2tar/write_tree.c
@@ -102,9 +102,9 @@ static int write_tree_dfs(const sqfs_tree_node_t *n)
return 0;
}
- name = sqfs_tree_node_get_path(n);
- if (name == NULL) {
- perror("resolving tree node path");
+ ret = sqfs_tree_node_get_path(n, &name);
+ if (ret != 0) {
+ sqfs_perror(NULL, "resolving tree node path", ret);
return -1;
}
diff --git a/bin/sqfsdiff/node_compare.c b/bin/sqfsdiff/node_compare.c
index 6e8c2fa..a0c99c7 100644
--- a/bin/sqfsdiff/node_compare.c
+++ b/bin/sqfsdiff/node_compare.c
@@ -8,13 +8,14 @@
int node_compare(sqfsdiff_t *sd, sqfs_tree_node_t *a, sqfs_tree_node_t *b)
{
- char *path = sqfs_tree_node_get_path(a);
sqfs_tree_node_t *ait, *bit;
bool promoted, demoted;
int ret, status = 0;
+ char *path;
- if (path == NULL) {
- perror("constructing absolute file path");
+ ret = sqfs_tree_node_get_path(a, &path);
+ if (ret != 0) {
+ sqfs_perror(NULL, "constructing absolute file path", ret);
return -1;
}
diff --git a/bin/sqfsdiff/util.c b/bin/sqfsdiff/util.c
index ab6fa59..a11770f 100644
--- a/bin/sqfsdiff/util.c
+++ b/bin/sqfsdiff/util.c
@@ -8,10 +8,12 @@
char *node_path(const sqfs_tree_node_t *n)
{
- char *path = sqfs_tree_node_get_path(n);
+ char *path;
+ int ret;
- if (path == NULL) {
- perror("get path");
+ ret = sqfs_tree_node_get_path(n, &path);
+ if (ret != 0) {
+ sqfs_perror(NULL, "get path", ret);
return NULL;
}
diff --git a/include/sqfs/dir_reader.h b/include/sqfs/dir_reader.h
index 3ae4ca4..e6b23f2 100644
--- a/include/sqfs/dir_reader.h
+++ b/include/sqfs/dir_reader.h
@@ -397,13 +397,23 @@ SQFS_API void sqfs_dir_tree_destroy(sqfs_tree_node_t *root);
* non-root nodes. The resulting path is slash separated, but (except for
* the root) never ends with a slash.
*
+ * While walking the node list, the function enforces various invariantes. It
+ * returns @ref SQFS_ERROR_LINK_LOOP if the list of parent pointers is cyclical,
+ * @ref SQFS_ERROR_CORRUPTED if any node has an empty name, or a name that
+ * contains '/' or equals ".." or ".". The function
+ * returns @ref SQFS_ERROR_ARG_INVALID if given NULL node or the root has a name
+ * set. Additionally, the function can return overflow or allocation failures
+ * while constructing the path.
+ *
* The returned string needs to be free'd with @ref sqfs_free.
*
* @param node A pointer to a tree node.
+ * @param out Returns a pointer to a string on success, set to NULL on failure.
*
- * @return A pointer to a string on success, NULL on allocation failure.
+ * @return Zero on success, an @ref SQFS_ERROR value on failure.
*/
-SQFS_API char *sqfs_tree_node_get_path(const sqfs_tree_node_t *node);
+SQFS_API int sqfs_tree_node_get_path(const sqfs_tree_node_t *node,
+ char **out);
#ifdef __cplusplus
}
diff --git a/lib/common/hardlink.c b/lib/common/hardlink.c
index 031724b..f8d4d4a 100644
--- a/lib/common/hardlink.c
+++ b/lib/common/hardlink.c
@@ -49,9 +49,9 @@ static int map_nodes(rbtree_t *inumtree, sqfs_hard_link_t **out,
goto fail_oom;
lnk->inode_number = idx;
- lnk->target = sqfs_tree_node_get_path(target);
- if (lnk->target == NULL)
- goto fail_oom;
+ ret = sqfs_tree_node_get_path(target, &lnk->target);
+ if (ret != 0)
+ goto fail_path;
if (canonicalize_name(lnk->target) == 0) {
lnk->next = (*out);
@@ -61,6 +61,10 @@ static int map_nodes(rbtree_t *inumtree, sqfs_hard_link_t **out,
free(lnk);
}
return 0;
+fail_path:
+ sqfs_perror(NULL, "re-constructing hard link path", ret);
+ free(lnk);
+ return -1;
fail_oom:
fputs("detecting hard links in file system tree: out of memory\n",
stderr);
diff --git a/lib/sqfs/dir_reader/get_path.c b/lib/sqfs/dir_reader/get_path.c
index bdd8317..847bfd3 100644
--- a/lib/sqfs/dir_reader/get_path.c
+++ b/lib/sqfs/dir_reader/get_path.c
@@ -10,33 +10,72 @@
#include <string.h>
#include <stdlib.h>
-char *sqfs_tree_node_get_path(const sqfs_tree_node_t *node)
+int sqfs_tree_node_get_path(const sqfs_tree_node_t *node, char **out)
{
const sqfs_tree_node_t *it;
+ size_t clen, len = 0;
char *str, *ptr;
- size_t len = 0;
- if (node->parent == NULL)
- return strdup("/");
+ *out = NULL;
- for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
- len += strlen((const char *)it->name) + 1;
+ if (node == NULL)
+ return SQFS_ERROR_ARG_INVALID;
+
+ for (it = node; it->parent != NULL; it = it->parent) {
+ if (it->parent == node)
+ return SQFS_ERROR_LINK_LOOP;
+
+ /* non-root nodes must have a valid name */
+ clen = strlen((const char *)it->name);
+
+ if (clen == 0)
+ return SQFS_ERROR_CORRUPTED;
+
+ if (strchr((const char *)it->name, '/') != NULL)
+ return SQFS_ERROR_CORRUPTED;
+
+ if (it->name[0] == '.') {
+ if (clen == 1 || (clen == 2 && it->name[1] == '.'))
+ return SQFS_ERROR_CORRUPTED;
+ }
+
+ /* compute total path length */
+ if (SZ_ADD_OV(clen, 1, &clen))
+ return SQFS_ERROR_OVERFLOW;
+
+ if (SZ_ADD_OV(len, clen, &len))
+ return SQFS_ERROR_OVERFLOW;
}
- str = malloc(len + 1);
- if (str == NULL)
- return NULL;
+ /* root node must not have a name */
+ if (it->name[0] != '\0')
+ return SQFS_ERROR_ARG_INVALID;
+
+ /* generate the path */
+ if (node->parent == NULL) {
+ str = strdup("/");
+ if (str == NULL)
+ return SQFS_ERROR_ALLOC;
+ } else {
+ if (SZ_ADD_OV(len, 1, &len))
+ return SQFS_ERROR_OVERFLOW;
+
+ str = malloc(len);
+ if (str == NULL)
+ return SQFS_ERROR_ALLOC;
- ptr = str + len;
- *ptr = '\0';
+ ptr = str + len - 1;
+ *ptr = '\0';
- for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
- len = strlen((const char *)it->name);
- ptr -= len;
+ for (it = node; it->parent != NULL; it = it->parent) {
+ len = strlen((const char *)it->name);
+ ptr -= len;
- memcpy(ptr, (const char *)it->name, len);
- *(--ptr) = '/';
+ memcpy(ptr, (const char *)it->name, len);
+ *(--ptr) = '/';
+ }
}
- return str;
+ *out = str;
+ return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 12:12:58 +0000