From: Aditya Pakki <pakki001@umn.edu>
To: pakki001@umn.edu
Cc: kjlu@umn.edu, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] bpf: Replace BUG_ON when fp_old is NULL
Date: Sun, 15 Dec 2019 09:44:32 -0600 [thread overview]
Message-ID: <20191215154432.22399-1-pakki001@umn.edu> (raw)
If fp_old is NULL in bpf_prog_realloc, the program does an assertion
and crashes. However, we can continue execution by returning NULL to
the upper callers. The patch fixes this issue.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
kernel/bpf/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 49e32acad7d8..4b46654fb26b 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -222,7 +222,8 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
u32 pages, delta;
int ret;
- BUG_ON(fp_old == NULL);
+ if (!fp_old)
+ return NULL;
size = round_up(size, PAGE_SIZE);
pages = size / PAGE_SIZE;
--
2.20.1
next reply other threads:[~2019-12-15 15:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-15 15:44 Aditya Pakki [this message]
2019-12-15 22:08 ` [PATCH] bpf: Replace BUG_ON when fp_old is NULL Yonghong Song
2019-12-16 11:17 ` Daniel Borkmann
2019-12-19 17:39 ` Aditya Pakki
2019-12-19 17:48 ` Daniel Borkmann
2019-12-16 4:49 ` Alexei Starovoitov
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