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OpenCloudOS-Kernel
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[CIFS] Make cifs_unlink consistent in checks for null inode 

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2009-04-20 19:45:13 +00:00
parent ff54250a0e
commit ff6945279d
3 changed files with 22 additions and 7 deletions
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6
fs/cifs/CHANGES
View File

@ -1,3 +1,9 @@
Version 1.58
------------
Guard against buffer overruns in various UCS-2 to UTF-8 string conversions
when the UTF-8 string is composed of unusually long (more than 4 byte) converted
characters.
Version 1.57
------------
Improve support for multiple security contexts to the same server. We

2
fs/cifs/cifsfs.h
View File

@ -100,5 +100,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
extern const struct export_operations cifs_export_ops;
#endif /* EXPERIMENTAL */
#define CIFS_VERSION "1.57"
#define CIFS_VERSION "1.58"
#endif /* _CIFSFS_H */

21
fs/cifs/inode.c
View File

@ -962,13 +962,21 @@ undo_setattr:
goto out_close;
}
/*
* If dentry->d_inode is null (usually meaning the cached dentry
* is a negative dentry) then we would attempt a standard SMB delete, but
* if that fails we can not attempt the fall back mechanisms on EACESS
* but will return the EACESS to the caller. Note that the VFS does not call
* unlink on negative dentries currently.
*/
int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
int xid;
char *full_path = NULL;
struct inode *inode = dentry->d_inode;
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsInodeInfo *cifs_inode;
struct super_block *sb = dir->i_sb;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifsTconInfo *tcon = cifs_sb->tcon;
@ -1012,7 +1020,7 @@ psx_del_no_retry:
rc = cifs_rename_pending_delete(full_path, dentry, xid);
if (rc == 0)
drop_nlink(inode);
} else if (rc == -EACCES && dosattr == 0) {
} else if ((rc == -EACCES) && (dosattr == 0) && inode) {
attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
if (attrs == NULL) {
rc = -ENOMEM;
@ -1020,7 +1028,8 @@ psx_del_no_retry:
}
/* try to reset dos attributes */
origattr = cifsInode->cifsAttrs;
cifs_inode = CIFS_I(inode);
origattr = cifs_inode->cifsAttrs;
if (origattr == 0)
origattr |= ATTR_NORMAL;
dosattr = origattr & ~ATTR_READONLY;
@ -1041,13 +1050,13 @@ psx_del_no_retry:
out_reval:
if (inode) {
cifsInode = CIFS_I(inode);
cifsInode->time = 0; /* will force revalidate to get info
cifs_inode = CIFS_I(inode);
cifs_inode->time = 0; /* will force revalidate to get info
when needed */
inode->i_ctime = current_fs_time(sb);
}
dir->i_ctime = dir->i_mtime = current_fs_time(sb);
cifsInode = CIFS_I(dir);
cifs_inode = CIFS_I(dir);
CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
kfree(full_path);