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 --- tools/perf/util/rlimit.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 tools/perf/util/rlimit.c (limited to 'tools/perf/util/rlimit.c') diff --git a/tools/perf/util/rlimit.c b/tools/perf/util/rlimit.c new file mode 100644 index 000000000..f857405fe --- /dev/null +++ b/tools/perf/util/rlimit.c @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: LGPL-2.1 */ + +#include +#include "util/debug.h" +#include "util/rlimit.h" +#include +#include + +/* + * Bump the memlock so that we can get bpf maps of a reasonable size, + * like the ones used with 'perf trace' and with 'perf test bpf', + * improve this to some specific request if needed. + */ +void rlimit__bump_memlock(void) +{ + struct rlimit rlim; + + if (getrlimit(RLIMIT_MEMLOCK, &rlim) == 0) { + rlim.rlim_cur *= 4; + rlim.rlim_max *= 4; + + if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) { + rlim.rlim_cur /= 2; + rlim.rlim_max /= 2; + + if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) + pr_debug("Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc\n"); + } + } +} + +bool rlimit__increase_nofile(enum rlimit_action *set_rlimit) +{ + int old_errno; + struct rlimit l; + + if (*set_rlimit < INCREASED_MAX) { + old_errno = errno; + + if (getrlimit(RLIMIT_NOFILE, &l) == 0) { + if (*set_rlimit == NO_CHANGE) { + l.rlim_cur = l.rlim_max; + } else { + l.rlim_cur = l.rlim_max + 1000; + l.rlim_max = l.rlim_cur; + } + if (setrlimit(RLIMIT_NOFILE, &l) == 0) { + (*set_rlimit) += 1; + errno = old_errno; + return true; + } + } + errno = old_errno; + } + + return false; +} -- cgit v1.3.1