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udf: Fix possible corruption when close races with write 

When we close a file, we remove preallocated blocks from it. But this
truncation was not protected by i_mutex and thus it could have raced with a
write through a different fd and cause crashes or even filesystem corruption.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2009-08-07 00:27:27 +02:00
parent 81056dd044
commit cbc8cc3352
1 changed files with 2 additions and 0 deletions
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2
fs/udf/file.c
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@ -193,9 +193,11 @@ int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
static int udf_release_file(struct inode *inode, struct file *filp) static int udf_release_file(struct inode *inode, struct file *filp)
{ {
if (filp->f_mode & FMODE_WRITE) { if (filp->f_mode & FMODE_WRITE) {
mutex_lock(&inode->i_mutex);
lock_kernel(); lock_kernel();
udf_discard_prealloc(inode); udf_discard_prealloc(inode);
unlock_kernel(); unlock_kernel();
mutex_unlock(&inode->i_mutex);
} }
return 0; return 0;
} }