diff options
| author | Su Yue <suy.fnst@cn.fujitsu.com> | 2017-05-03 09:50:14 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-05-15 16:13:17 +0200 |
| commit | 9c44ef6ecfefbf5f62b5e1c41637a5ac0ed50bb1 (patch) | |
| tree | eba54d4ce49e449a090403d55946de0b2b26d2bb /cmds-check.c | |
| parent | ca1be56db5b6ec8ccad36c3bc4bf215757350e92 (diff) | |
btrfs-progs: check: Fix heap use after free
fsck/004-no-dir-index makes valgrinds complaining about Invalid read.
==31890== Invalid read of size 1
==31890== at 0x453D09: repair_inode_backrefs (cmds-check.c:2690)
==31890== by 0x453D09: check_inode_recs (cmds-check.c:3330)
==31890== by 0x453D09: check_fs_root (cmds-check.c:4012)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890== Address 0x5cb7b90 is 16 bytes inside a block of size 50 free'd
==31890== at 0x4C2C14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==31890== by 0x453D08: repair_inode_backrefs (cmds-check.c:2684)
==31890== by 0x453D08: check_inode_recs (cmds-check.c:3330)
==31890== by 0x453D08: check_fs_root (cmds-check.c:4012)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890== Block was alloc'd at
==31890== at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==31890== by 0x45055C: get_inode_backref (cmds-check.c:1075)
==31890== by 0x45055C: add_inode_backref (cmds-check.c:1097)
==31890== by 0x45180C: process_dir_item (cmds-check.c:1525)
==31890== by 0x45180C: process_one_leaf (cmds-check.c:1838)
==31890== by 0x45180C: walk_down_tree (cmds-check.c:2134)
==31890== by 0x45180C: check_fs_root (cmds-check.c:3957)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890==
==31890== Invalid read of size 8
==31890== at 0x452D66: repair_inode_backrefs (cmds-check.c:2731)
==31890== by 0x452D66: check_inode_recs (cmds-check.c:3330)
==31890== by 0x452D66: check_fs_root (cmds-check.c:4012)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890== Address 0x5cb7b90 is 16 bytes inside a block of size 50 free'd
==31890== at 0x4C2C14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==31890== by 0x453D08: repair_inode_backrefs (cmds-check.c:2684)
==31890== by 0x453D08: check_inode_recs (cmds-check.c:3330)
==31890== by 0x453D08: check_fs_root (cmds-check.c:4012)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890== Block was alloc'd at
==31890== at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==31890== by 0x45055C: get_inode_backref (cmds-check.c:1075)
==31890== by 0x45055C: add_inode_backref (cmds-check.c:1097)
==31890== by 0x45180C: process_dir_item (cmds-check.c:1525)
==31890== by 0x45180C: process_one_leaf (cmds-check.c:1838)
==31890== by 0x45180C: walk_down_tree (cmds-check.c:2134)
==31890== by 0x45180C: check_fs_root (cmds-check.c:3957)
==31890== by 0x45E788: check_fs_roots (cmds-check.c:4098)
==31890== by 0x45E788: cmd_check (cmds-check.c:13031)
==31890== by 0x40A88A: main (btrfs.c:246)
==31890==
While iterating over backrefs in repair_inode_backrefs, there are
several situations to repair one backref according
backref->found_dir_item and backref->found_dir_index. Two of these
branches may free the backref, but next checks will still access the
freed memory.
Because these branches are independent, let repair_inode_backrefs skip
to handle next backref after free can fix it.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'cmds-check.c')
| -rw-r--r-- | cmds-check.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/cmds-check.c b/cmds-check.c index afa78230..6b002011 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -2667,6 +2667,7 @@ static int repair_inode_backrefs(struct btrfs_root *root, repaired++; list_del(&backref->list); free(backref); + continue; } if (!delete && !backref->found_dir_index && @@ -2677,12 +2678,12 @@ static int repair_inode_backrefs(struct btrfs_root *root, break; repaired++; if (backref->found_dir_item && - backref->found_dir_index && backref->found_dir_index) { if (!backref->errors && backref->found_inode_ref) { list_del(&backref->list); free(backref); + continue; } } } |