After reading the slram sources I found two things. First of all the

memset(mymtd, 0, sizeof(*mymtd));

In my opinion this is not neccesary because this is done two lines below this
one. The next thing I found is the

memset(mymtd->priv, 0, sizeof(struct mypriv));

If the allocation of the priv field failed above mymtd is set to NULL. If
the priv-field is accessed I guess this would lead to a segmentation fault.

Attached to this mail I send a patch to cover both this issues. I hope this
may be helpfull in some way.

jochen