On Fri, 01 Oct 2010 21:23:33 +0530 Suresh Jayaraman <sjayaraman@xxxxxxx> wrote: > FindFirst failure due to permission errors or any other errors are silently > ignored by cifs_readdir(). This could cause problem to applications that depend > on the error to do further processing. > > Reproducer: > - mount a cifs share > - mkdir tdir;touch tdir/1 tdir/2 tdir/3 > - chmod -x tdir > - ls tdir > > Currently, we start calling filldir() for '.' and '..' before we know we > whether FindFirst could succeed or not. If FindFirst fails later, there is no > way to notify VFS by setting buf.error and so VFS won't be able to catch this. > Fix this by moving the call to initiate_cifs_search() before we start doing > filldir(). > > This fixes https://bugzilla.samba.org/show_bug.cgi?id=7535 > > Reported-by: Tom Dexter <digitalaudiorock@xxxxxxxxx> > Signed-off-by: Suresh Jayaraman <sjayaraman@xxxxxxx> > --- > fs/cifs/readdir.c | 19 +++++++++++-------- > 1 files changed, 11 insertions(+), 8 deletions(-) > > diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c > index 887a7e2..edb69a9 100644 > --- a/fs/cifs/readdir.c > +++ b/fs/cifs/readdir.c > @@ -786,6 +786,17 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) > > cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); > > + /* > + * Ensure FindFirst doesn't fail before doing filldir() for '.' and > + * '..'. Otherwise we won't be able to notify VFS in case of failure. > + */ > + if (file->private_data == NULL) { > + rc = initiate_cifs_search(xid, file); > + cFYI(1, "initiate cifs search rc %d", rc); > + if (rc) > + goto rddir2_exit; > + } > + > switch ((int) file->f_pos) { > case 0: > if (filldir(direntry, ".", 1, file->f_pos, > @@ -810,14 +821,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) > if after then keep searching till find it */ > > if (file->private_data == NULL) { > - rc = initiate_cifs_search(xid, file); > - cFYI(1, "initiate cifs search rc %d", rc); > - if (rc) { > - FreeXid(xid); > - return rc; > - } > - } > - if (file->private_data == NULL) { > rc = -EINVAL; > FreeXid(xid); > return rc; > -- > To unsubscribe from this list: send the line "unsubscribe linux-cifs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Looks correct to me. Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
