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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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LoongArch: BPF: Zero-extend bpf_tail_call() index

The bpf_tail_call() index should be treated as a u32 value. Let's
zero-extend it to avoid calling wrong BPF progs. See similar fixes
for x86 [1]) and arm64 ([2]) for more details.

[1]: https://github.com/torvalds/linux/commit/90caccdd8cc0215705f18b92771b449b01e2474a
[2]: https://github.com/torvalds/linux/commit/16338a9b3ac30740d49f5dfed81bac0ffa53b9c7

Cc: stable@vger.kernel.org
Fixes: 5dc615520c4d ("LoongArch: Add BPF JIT support")
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

authored by

Hengqi Chen and committed by
Huacai Chen eb71f5c4 3f5a238f

+2
+2
arch/loongarch/net/bpf_jit.c
··· 280 280 * goto out; 281 281 */ 282 282 tc_ninsn = insn ? ctx->offset[insn+1] - ctx->offset[insn] : ctx->offset[0]; 283 + emit_zext_32(ctx, a2, true); 284 + 283 285 off = offsetof(struct bpf_array, map.max_entries); 284 286 emit_insn(ctx, ldwu, t1, a1, off); 285 287 /* bgeu $a2, $t1, jmp_offset */