Segmentation fault in e4defrag -c

["Steinar H. Gunderson" <sgunderson@bigfoot.com>]

Hi,

I tested e4defrag -c (granted, on a 2.6.30-rc kernel, so it doesn't actually
have the defrag patches, but checking should still work, right?) and it
segfaults with a null pointer deference on certain filesystems. Could you
please take a look?

pannekake:/home/sesse# gdb ./e4defrag
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
(gdb) r -c /dev/mapper/pannekake-home
Starting program: /home/sesse/e4defrag -c /dev/mapper/pannekake-home

Program received signal SIGSEGV, Segmentation fault.
0x00000000004027b9 in get_physical_count (physical_list_head=0x0) at e4defrag.c:1055
1055			if ((ext_list_tmp->data.physical + ext_list_tmp->data.len)
(gdb) bt full
#0  0x00000000004027b9 in get_physical_count (physical_list_head=0x0) at e4defrag.c:1055
	ret = 0
	ext_list_tmp = (struct fiemap_extent_list *) 0x0
#1  0x0000000000402f6c in file_statistic (file=0x60e260 "/home/sesse/Mika - Life In Cartoon Motion/11 - Ring Ring (Bonus Track).mp3", 
    buf=0x7fff33662fd0, flag=0, ftwbuf=0x7fff33667378) at e4defrag.c:1326
	fd = 8
	ret = 0
	now_ext_count = 862335568
	best_ext_count = 32767
	physical_ext_count = 862352208
	i = 32767
	j = 32
	ratio = 0
	blk_count = 0
	msg_buffer = "(", '\0' <repeats 15 times>, "\030!f3ÿ\177\000\000\000\000\000\000f\000\000\000À\022a\000\000\000\000\000/home/se/home/lo\a\000\000\000\000\000\000\000\2200f3ÿ\177\000\000\035\000\000\000\000\000\000\000P2f3ÿ\177\000\000\004\000\000\000\000\000\000\000à0f3ÿ\177\000\000Ñ,@\000\000\000\000\000P2f3ÿ\177\000\000VêÜæb\177\000\000Psf3ÿ\177\000\000C'@\000\000\000\000\000\020Ð`\000\000\000\000\000ày\nçb\177\000\000xsf3ÿ\177\000\000\f\000\000\000\001\000\000\000@1f3ÿ\177\000\000`â`", '\0' <repeats 21 times>, "Psf3ÿ\177\000\000"...
	physical_list_head = (struct fiemap_extent_list *) 0x0
	logical_list_head = (struct fiemap_extent_list *) 0x0
#2  0x00007f62e6e1d73a in ?? () from /lib/libc.so.6
No symbol table info available.
#3  0x00007f62e6e1da85 in ?? () from /lib/libc.so.6
No symbol table info available.
#4  0x00007f62e6e1d67e in ?? () from /lib/libc.so.6
No symbol table info available.
#5  0x00007f62e6e1da85 in ?? () from /lib/libc.so.6
No symbol table info available.
#6  0x00007f62e6e1d67e in ?? () from /lib/libc.so.6
No symbol table info available.
#7  0x00007f62e6e1da85 in ?? () from /lib/libc.so.6
No symbol table info available.
#8  0x00007f62e6e1e2cb in ?? () from /lib/libc.so.6
No symbol table info available.
#9  0x0000000000404a67 in main (argc=3, argv=0x7fff336689e8) at e4defrag.c:2022
	mount_dir_len = 32767
	opt = -1
	i = 2
	j = 0
	flags = 3
	arg_type = 0
	success_flag = 0
	dir_name = "/home", '\0' <repeats 4091 times>
	buf = {st_dev = 64787, st_ino = 2, st_nlink = 33, st_mode = 16877, st_uid = 0, st_gid = 0, pad0 = 0, st_rdev = 0, st_size = 4096, 
  st_blksize = 4096, st_blocks = 8, st_atim = {tv_sec = 1245891895, tv_nsec = 968453897}, st_mtim = {tv_sec = 1245401183, 
    tv_nsec = 304453887}, st_ctim = {tv_sec = 1245401183, tv_nsec = 304453887}, __unused = {0, 0, 0}}
	sb = {s_inodes_count = 2621440, s_blocks_count_lo = 10485760, s_r_blocks_count_lo = 524224, s_free_blocks_count_lo = 3310667, 
  s_free_inodes_count = 2377762, s_first_data_block = 0, s_log_block_size = 2, s_obso_log_frag_size = 2, s_blocks_per_group = 32768, 
  s_obso_frags_per_group = 32768, s_inodes_per_group = 8192, s_mtime = 1243121832, s_wtime = 1243121832, s_mnt_count = 11, 
  s_max_mnt_count = 38, s_magic = 61267, s_state = 1, s_errors = 1, s_minor_rev_level = 0, s_lastcheck = 1239019329, 
  s_checkinterval = 15552000, s_creator_os = 0, s_rev_level = 1, s_def_resuid = 0, s_def_resgid = 0, s_first_ino = 11, 
  s_inode_size = 256, s_block_group_nr = 0, s_feature_compat = 60, s_feature_incompat = 582, s_feature_ro_compat = 123, 
  s_uuid = "À{Ó;{rM*\227±Ã\22742\v2", s_volume_name = '\0' <repeats 15 times>, s_last_mounted = '\0' <repeats 63 times>, 
  s_algorithm_usage_bitmap = 0, s_prealloc_blocks = 0 '\0', s_prealloc_dir_blocks = 0 '\0', s_reserved_gdt_blocks = 1021, 
  s_journal_uuid = '\0' <repeats 15 times>, s_journal_inum = 8, s_journal_dev = 0, s_last_orphan = 655808, s_hash_seed = {3246912957, 
    3041674718, 1885689521, 1976377087}, s_def_hash_version = 2 '\002', s_reserved_char_pad = 1 '\001', s_desc_size = 0, 
  s_default_mount_opts = 0, s_first_meta_bg = 0, s_mkfs_time = 1219499056, s_jnl_blocks = {9255, 9256, 9257, 9258, 9259, 9260, 9261, 
    9262, 9263, 9264, 9265, 9266, 9267, 10292, 0, 0, 134217728}, s_blocks_count_hi = 0, s_r_blocks_count_hi = 0, 
  s_free_blocks_count_hi = 0, s_min_extra_isize = 28, s_want_extra_isize = 28, s_flags = 1, s_raid_stride = 0, s_mmp_interval = 0, 
  s_mmp_block = 0, s_raid_stripe_width = 0, s_log_groups_per_flex = 4 '\004', s_reserved_char_pad2 = 0 '\0', s_reserved_pad = 0, 
  s_reserved = {15648, 0 <repeats 161 times>}}

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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