jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to_fragtree()
In jffs2_add_frag_to_fragtree(), there is an if statement on line 223 to check whether "this" is NULL: if (this) When "this" is NULL, it is used at several places, such as on line 249: if (this->node) and on line 260: if (newfrag->ofs > this->ofs) Thus possible null-pointer dereferences may occur. To fix these bugs, -EINVAL is returned when "this" is NULL. These bugs are found by a static analysis tool STCheck written by us. Signed-off-by: NJia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: NRichard Weinberger <richard@nod.at>
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