mke2fs: Avoid crashes / infinite loops for absurdly large devices

[tools/e2fsprogs.git] / misc / mke2fs.c

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index d98e71e..6a83bd9 100644 (file)
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -2089,6 +2089,18 @@ profile_error:
                        EXT2_BLOCK_SIZE(&fs_param));
                exit(1);
        }
+       /*
+        * Guard against group descriptor count overflowing... Mostly to avoid
+        * strange results for absurdly large devices.
+        */
+       if (fs_blocks_count > ((1ULL << (fs_param.s_log_block_size + 3 + 32)) - 1)) {
+               fprintf(stderr, _("%s: Size of device (0x%llx blocks) %s "
+                                 "too big to create\n\t"
+                                 "a filesystem using a blocksize of %d.\n"),
+                       program_name, fs_blocks_count, device_name,
+                       EXT2_BLOCK_SIZE(&fs_param));
+               exit(1);
+       }
 
        ext2fs_blocks_count_set(&fs_param, fs_blocks_count);