bpf: Remove unnecessary assertion on fp_old

The two callers of bpf_prog_realloc - bpf_patch_insn_single and
bpf_migrate_filter dereference the struct fp_old, before passing
it to the function. Thus assertion to check fp_old is unnecessary
and can be removed.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191219175735.19231-1-pakki001@umn.edu

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 2ff01a7..7622dfc 100644 (file)
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -222,8 +222,6 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
        u32 pages, delta;
        int ret;
 
-       BUG_ON(fp_old == NULL);
-
        size = round_up(size, PAGE_SIZE);
        pages = size / PAGE_SIZE;
        if (pages <= fp_old->pages)