From bce7698e2e6565bb765bd0522337f29f5f312624 Mon Sep 17 00:00:00 2001 From: Haojie Li Date: Tue, 25 Aug 2026 18:08:45 +0800 Subject: drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform device platform_device_register_data() can fail and return an ERR_PTR, but the return value is used without checking, leading to an invalid pointer being stored in ddp_comp[].dev and passed to component_match_add() and mtk_ddp_comp_init(), which could result in a kernel crash. Add an IS_ERR() check to jump to the error handling path on failure. Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195") Cc: stable@vger.kernel.org Signed-off-by: Haojie Li Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/ Signed-off-by: Chun-Kuang Hu --- samples/bpf/tracex5.bpf.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 samples/bpf/tracex5.bpf.c (limited to 'samples/bpf/tracex5.bpf.c') diff --git a/samples/bpf/tracex5.bpf.c b/samples/bpf/tracex5.bpf.c new file mode 100644 index 000000000..4d3d6c9b2 --- /dev/null +++ b/samples/bpf/tracex5.bpf.c @@ -0,0 +1,93 @@ +/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + */ +#include "vmlinux.h" +#include "syscall_nrs.h" +#include +#include +#include +#include +#include + +#define __stringify(x) #x +#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(key_size, sizeof(u32)); + __uint(value_size, sizeof(u32)); +#ifdef __mips__ + __uint(max_entries, 6000); /* MIPS n64 syscalls start at 5000 */ +#else + __uint(max_entries, 1024); +#endif +} progs SEC(".maps"); + +SEC("kprobe/__seccomp_filter") +int bpf_prog1(struct pt_regs *ctx) +{ + int sc_nr = (int)PT_REGS_PARM1(ctx); + + /* dispatch into next BPF program depending on syscall number */ + bpf_tail_call(ctx, &progs, sc_nr); + + /* fall through -> unknown syscall */ + if (sc_nr >= __NR_getuid && sc_nr <= __NR_getsid) { + char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n"; + bpf_trace_printk(fmt, sizeof(fmt), sc_nr); + } + return 0; +} + +/* we jump here when syscall number == __NR_write */ +PROG(SYS__NR_write)(struct pt_regs *ctx) +{ + struct seccomp_data sd; + + bpf_core_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx)); + if (sd.args[2] == 512) { + char fmt[] = "write(fd=%d, buf=%p, size=%d)\n"; + bpf_trace_printk(fmt, sizeof(fmt), + sd.args[0], sd.args[1], sd.args[2]); + } + return 0; +} + +PROG(SYS__NR_read)(struct pt_regs *ctx) +{ + struct seccomp_data sd; + + bpf_core_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx)); + if (sd.args[2] > 128 && sd.args[2] <= 1024) { + char fmt[] = "read(fd=%d, buf=%p, size=%d)\n"; + bpf_trace_printk(fmt, sizeof(fmt), + sd.args[0], sd.args[1], sd.args[2]); + } + return 0; +} + +#ifdef __NR_mmap2 +PROG(SYS__NR_mmap2)(struct pt_regs *ctx) +{ + char fmt[] = "mmap2\n"; + + bpf_trace_printk(fmt, sizeof(fmt)); + return 0; +} +#endif + +#ifdef __NR_mmap +PROG(SYS__NR_mmap)(struct pt_regs *ctx) +{ + char fmt[] = "mmap\n"; + + bpf_trace_printk(fmt, sizeof(fmt)); + return 0; +} +#endif + +char _license[] SEC("license") = "GPL"; +u32 _version SEC("version") = LINUX_VERSION_CODE; -- cgit v1.3.1