The patch titled
Subject: fat: fix oops on corrupted vfat fs
has been removed from the -mm tree. Its filename was
fat-fix-oops-on-corrupted-vfat-fs.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Subject: fat: fix oops on corrupted vfat fs
a) don't bother with ->d_time for positives - we only check it for
negatives anyway.
b) make sure to set it at unlink and rmdir time - at *that* point
soon-to-be negative dentry matches then-current directory contents
c) don't go into renaming of old alias in vfat_lookup() unless it
has the same parent (which it will, unless we are seeing corrupted
image)
[hirofumi@xxxxxxxxxxxxxxxxxx: make change minimum, don't call d_move() for dir]
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [3.17.x]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/namei_vfat.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff -puN fs/fat/namei_vfat.c~fat-fix-oops-on-corrupted-vfat-fs fs/fat/namei_vfat.c
--- a/fs/fat/namei_vfat.c~fat-fix-oops-on-corrupted-vfat-fs
+++ a/fs/fat/namei_vfat.c
@@ -736,7 +736,12 @@ static struct dentry *vfat_lookup(struct
}
alias = d_find_alias(inode);
- if (alias && !vfat_d_anon_disconn(alias)) {
+ /*
+ * Checking "alias->d_parent == dentry->d_parent" to make sure
+ * FS is not corrupted (especially double linked dir).
+ */
+ if (alias && alias->d_parent == dentry->d_parent &&
+ !vfat_d_anon_disconn(alias)) {
/*
* This inode has non anonymous-DCACHE_DISCONNECTED
* dentry. This means, the user did ->lookup() by an
@@ -755,12 +760,9 @@ static struct dentry *vfat_lookup(struct
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- dentry = d_splice_alias(inode, dentry);
- if (dentry)
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- return dentry;
-
+ if (!inode)
+ dentry->d_time = dir->i_version;
+ return d_splice_alias(inode, dentry);
error:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
return ERR_PTR(err);
@@ -793,7 +795,6 @@ static int vfat_create(struct inode *dir
inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
- dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -824,6 +825,7 @@ static int vfat_rmdir(struct inode *dir,
clear_nlink(inode);
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
+ dentry->d_time = dir->i_version;
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -849,6 +851,7 @@ static int vfat_unlink(struct inode *dir
clear_nlink(inode);
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
+ dentry->d_time = dir->i_version;
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -889,7 +892,6 @@ static int vfat_mkdir(struct inode *dir,
inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
- dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
mutex_unlock(&MSDOS_SB(sb)->s_lock);
_
Patches currently in -mm which might be from viro@xxxxxxxxxxxxxxxxxx are
origin.patch
fs-ext4-fsyncc-generic_file_fsync-call-based-on-barrier-flag.patch
block-restore-proc-partitions-to-not-display-non-partitionable-removable-devices.patch
char_dev-remove-pointless-assignment-from-__register_chrdev_region.patch
fs-seq_file-fallback-to-vmalloc-instead-of-oom-kill-processes.patch
procfs-fix-error-handling-of-proc_register.patch
ia64-trivial-replace-get_unused_fd-by-get_unused_fd_flags0.patch
ppc-cell-trivial-replace-get_unused_fd-by-get_unused_fd_flags0.patch
binfmt_misc-trivial-replace-get_unused_fd-by-get_unused_fd_flags0.patch
file-trivial-replace-get_unused_fd-by-get_unused_fd_flags0.patch
file-remove-get_unused_fd-macro.patch
binfmt_misc-add-comments-debug-logs.patch
binfmt_misc-clean-up-code-style-a-bit.patch
nilfs2-fix-the-nilfs_iget-vs-nilfs_new_inode-races.patch
syscalls-implement-execveat-system-call.patch
x86-hook-up-execveat-system-call.patch
syscalls-add-selftest-for-execveat2.patch
fs-affs-filec-adding-support-to-o_direct.patch
linux-next.patch
fallocate-create-fan_modify-and-in_modify-events.patch
kernel-forkc-export-kernel_thread-to-modules.patch
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