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bpftool: Fix NULL pointer dereference when pin {PROG, MAP, LINK} without FILE
[ Upstream commit34de8e6e0e
] When using bpftool to pin {PROG, MAP, LINK} without FILE, segmentation fault will occur. The reson is that the lack of FILE will cause strlen to trigger NULL pointer dereference. The corresponding stacktrace is shown below: do_pin do_pin_any do_pin_fd mount_bpffs_for_pin strlen(name) <- NULL pointer dereference Fix it by adding validation to the common process. Fixes:75a1e792c3
("tools: bpftool: Allow all prog/map handles for pinning objects") Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20221102084034.3342995-1-pulehui@huaweicloud.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -278,6 +278,9 @@ int do_pin_any(int argc, char **argv, int (*get_fd)(int *, char ***))
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int err;
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int fd;
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if (!REQ_ARGS(3))
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return -EINVAL;
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fd = get_fd(&argc, &argv);
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if (fd < 0)
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return fd;
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