Merge branch 'nd/hash-object-sanity'

[thirdparty/git.git] / sha1_file.c

diff --git a/sha1_file.c b/sha1_file.c
index 27730c334cb433ef749a0efc5353a7f38032559c..d949b35c3308ae5c06774da7f4fecdc84778d5eb 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -13,6 +13,7 @@
 #include "commit.h"
 #include "tag.h"
 #include "tree.h"
+#include "tree-walk.h"
 #include "refs.h"
 #include "pack-revindex.h"
 #include "sha1-lookup.h"
@@ -2479,8 +2480,37 @@ int has_sha1_file(const unsigned char *sha1)
        return has_loose_object(sha1);
 }
 
+static void check_tree(const void *buf, size_t size)
+{
+       struct tree_desc desc;
+       struct name_entry entry;
+
+       init_tree_desc(&desc, buf, size);
+       while (tree_entry(&desc, &entry))
+               /* do nothing
+                * tree_entry() will die() on malformed entries */
+               ;
+}
+
+static void check_commit(const void *buf, size_t size)
+{
+       struct commit c;
+       memset(&c, 0, sizeof(c));
+       if (parse_commit_buffer(&c, buf, size))
+               die("corrupt commit");
+}
+
+static void check_tag(const void *buf, size_t size)
+{
+       struct tag t;
+       memset(&t, 0, sizeof(t));
+       if (parse_tag_buffer(&t, buf, size))
+               die("corrupt tag");
+}
+
 static int index_mem(unsigned char *sha1, void *buf, size_t size,
-                    int write_object, enum object_type type, const char *path)
+                    int write_object, enum object_type type,
+                    const char *path, int format_check)
 {
        int ret, re_allocated = 0;
 
@@ -2498,6 +2528,14 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size,
                        re_allocated = 1;
                }
        }
+       if (format_check) {
+               if (type == OBJ_TREE)
+                       check_tree(buf, size);
+               if (type == OBJ_COMMIT)
+                       check_commit(buf, size);
+               if (type == OBJ_TAG)
+                       check_tag(buf, size);
+       }
 
        if (write_object)
                ret = write_sha1_file(buf, size, typename(type), sha1);
@@ -2511,7 +2549,7 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size,
 #define SMALL_FILE_SIZE (32*1024)
 
 int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
-            enum object_type type, const char *path)
+            enum object_type type, const char *path, int format_check)
 {
        int ret;
        size_t size = xsize_t(st->st_size);
@@ -2520,23 +2558,25 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object,
                struct strbuf sbuf = STRBUF_INIT;
                if (strbuf_read(&sbuf, fd, 4096) >= 0)
                        ret = index_mem(sha1, sbuf.buf, sbuf.len, write_object,
-                                       type, path);
+                                       type, path, format_check);
                else
                        ret = -1;
                strbuf_release(&sbuf);
        } else if (!size) {
-               ret = index_mem(sha1, NULL, size, write_object, type, path);
+               ret = index_mem(sha1, NULL, size, write_object, type, path,
+                               format_check);
        } else if (size <= SMALL_FILE_SIZE) {
                char *buf = xmalloc(size);
                if (size == read_in_full(fd, buf, size))
                        ret = index_mem(sha1, buf, size, write_object, type,
-                                       path);
+                                       path, format_check);
                else
                        ret = error("short read %s", strerror(errno));
                free(buf);
        } else {
                void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
-               ret = index_mem(sha1, buf, size, write_object, type, path);
+               ret = index_mem(sha1, buf, size, write_object, type, path,
+                               format_check);
                munmap(buf, size);
        }
        close(fd);
@@ -2554,7 +2594,7 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, int write
                if (fd < 0)
                        return error("open(\"%s\"): %s", path,
                                     strerror(errno));
-               if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path) < 0)
+               if (index_fd(sha1, fd, st, write_object, OBJ_BLOB, path, 0) < 0)
                        return error("%s: failed to insert into database",
                                     path);
                break;