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bpf: Fix off-by-one boundary validation in arena direct-value access #11956

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bpf: Fix off-by-one boundary validation in arena direct-value access #11956

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2 changes: 1 addition & 1 deletion kernel/bpf/arena.c
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Original file line number Diff line number Diff line change
Expand Up @@ -511,7 +511,7 @@ static int arena_map_direct_value_addr(const struct bpf_map *map, u64 *imm, u32
{
struct bpf_arena *arena = container_of(map, struct bpf_arena, map);

if ((u64)off > arena->user_vm_end - arena->user_vm_start)
if ((u64)off >= arena->user_vm_end - arena->user_vm_start)
return -ERANGE;
*imm = (unsigned long)arena->user_vm_start;
return 0;
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