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Message-Id: <20191219175735.19231-1-pakki001@umn.edu>
Date: Thu, 19 Dec 2019 11:57:35 -0600
From: Aditya Pakki <pakki001@....edu>
To: pakki001@....edu
Cc: kjlu@....edu, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] 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@....edu>
---
v1: Remove the check on fp_old altogether, as suggested by
Daniel Borkmann and Alexei Starovoitov.
---
kernel/bpf/core.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 49e32acad7d8..ca010b783687 100644
--- 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)
--
2.20.1
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