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Diffstat (limited to 'lib/sqfs/write_inode.c')
-rw-r--r--lib/sqfs/write_inode.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/lib/sqfs/write_inode.c b/lib/sqfs/write_inode.c
index b5ba905..86ed146 100644
--- a/lib/sqfs/write_inode.c
+++ b/lib/sqfs/write_inode.c
@@ -14,18 +14,26 @@
#include "compat.h"
#include <string.h>
+#include <alloca.h>
static int write_block_sizes(sqfs_meta_writer_t *ir,
const sqfs_inode_generic_t *n)
{
- sqfs_u32 sizes[n->num_file_blocks];
+ sqfs_u32 *sizes;
size_t i;
- for (i = 0; i < n->num_file_blocks; ++i)
+ if (n->payload_bytes_used < sizeof(sizes[0]))
+ return 0;
+
+ if ((n->payload_bytes_used % sizeof(sizes[0])) != 0)
+ return SQFS_ERROR_CORRUPTED;
+
+ sizes = alloca(n->payload_bytes_used);
+
+ for (i = 0; i < (n->payload_bytes_used / sizeof(sizes[0])); ++i)
sizes[i] = htole32(n->extra[i]);
- return sqfs_meta_writer_append(ir, sizes,
- sizeof(sqfs_u32) * n->num_file_blocks);
+ return sqfs_meta_writer_append(ir, sizes, n->payload_bytes_used);
}
static int write_dir_index(sqfs_meta_writer_t *ir, const sqfs_u8 *data,
@@ -102,7 +110,7 @@ int sqfs_meta_writer_write_inode(sqfs_meta_writer_t *ir,
ret = sqfs_meta_writer_append(ir, &file, sizeof(file));
if (ret)
return ret;
- return n->num_file_blocks ? write_block_sizes(ir, n) : 0;
+ return write_block_sizes(ir, n);
}
case SQFS_INODE_SLINK: {
sqfs_inode_slink_t slink = {
@@ -144,7 +152,7 @@ int sqfs_meta_writer_write_inode(sqfs_meta_writer_t *ir,
if (ret)
return ret;
return write_dir_index(ir, (const sqfs_u8 *)n->extra,
- n->num_dir_idx_bytes);
+ n->payload_bytes_used);
}
case SQFS_INODE_EXT_FILE: {
sqfs_inode_file_ext_t file = {
@@ -160,7 +168,7 @@ int sqfs_meta_writer_write_inode(sqfs_meta_writer_t *ir,
ret = sqfs_meta_writer_append(ir, &file, sizeof(file));
if (ret)
return ret;
- return n->num_file_blocks ? write_block_sizes(ir, n) : 0;
+ return write_block_sizes(ir, n);
}
case SQFS_INODE_EXT_SLINK: {
sqfs_inode_slink_t slink = {