bpf: fix 32-bit divide by zero

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due to some JITs doing if (src_reg == 0) check in 64-bit mode
for div/mod operations mask upper 32-bits of src register
before doing the check

Fixes: 622582786c ("net: filter: x86: internal BPF JIT")
Fixes: 7a12b5031c ("sparc64: Add eBPF JIT.")
Reported-by: syzbot+48340bb518e88849e2e3@syzkaller.appspotmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Alexei Starovoitov 2018-01-12 18:59:52 -08:00 • committed by Daniel Borkmann

parent c366287ebd

commit 68fda450a7

2 changed files with 22 additions and 0 deletions

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18

kernel/bpf/verifier.c

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4

net/core/filter.c

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