grep: handle corrupt index files early

diff --git a/sha1_file.c b/sha1_file.c
index 5a2014811fd0a42aa74b36bf3a470e471968be6f..36f85455e6748efb7c2d593c7a619fa13150600b 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -404,6 +404,9 @@ static void link_alt_odb_entries(const char *alt, int sep,
        struct strbuf objdirbuf = STRBUF_INIT;
        struct strbuf entry = STRBUF_INIT;
 
+       if (!alt || !*alt)
+               return;
+
        if (depth > 5) {
                error("%s: ignoring alternate object stores, nesting too deep.",
                                relative_base);
@@ -607,7 +610,6 @@ void prepare_alt_odb(void)
                return;
 
        alt = getenv(ALTERNATE_DB_ENVIRONMENT);
-       if (!alt) alt = "";
 
        alt_odb_tail = &alt_odb_list;
        link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
@@ -1124,10 +1126,14 @@ static int sha1_loose_object_info(const unsigned char *sha1,
        } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
                status = error("unable to parse %s header", sha1_to_hex(sha1));
 
-       if (status >= 0 && oi->contentp)
+       if (status >= 0 && oi->contentp) {
                *oi->contentp = unpack_sha1_rest(&stream, hdr,
                                                 *oi->sizep, sha1);
-       else
+               if (!*oi->contentp) {
+                       git_inflate_end(&stream);
+                       status = -1;
+               }
+       } else
                git_inflate_end(&stream);
 
        munmap(map, mapsize);
@@ -1748,10 +1754,15 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
                ret = index_mem(sha1, "", size, type, path, flags);
        } else if (size <= SMALL_FILE_SIZE) {
                char *buf = xmalloc(size);
-               if (size == read_in_full(fd, buf, size))
-                       ret = index_mem(sha1, buf, size, type, path, flags);
+               ssize_t read_result = read_in_full(fd, buf, size);
+               if (read_result < 0)
+                       ret = error_errno("read error while indexing %s",
+                                         path ? path : "<unknown>");
+               else if (read_result != size)
+                       ret = error("short read while indexing %s",
+                                   path ? path : "<unknown>");
                else
-                       ret = error_errno("short read");
+                       ret = index_mem(sha1, buf, size, type, path, flags);
                free(buf);
        } else {
                void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);