From: Candice Li Date: Wed, 13 May 2026 02:46:01 +0000 (+0800) Subject: drm/amd/ras: bound CPER record fetch buffer size X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c88fb7aa57d540e1867aad56d441e550692bd1a;p=thirdparty%2Flinux.git drm/amd/ras: bound CPER record fetch buffer size Bound CPER record fetch allocation by buffer size. v2: Drop redundant cap on cper_num and raise GET_CPER_RECORD max buffer size. Suggested-by: YiPeng Chai Signed-off-by: Candice Li Reviewed-by: Tao Zhou Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/ras/ras_mgr/amdgpu_virt_ras_cmd.c b/drivers/gpu/drm/amd/ras/ras_mgr/amdgpu_virt_ras_cmd.c index 4021259115cc..daad99a46263 100644 --- a/drivers/gpu/drm/amd/ras/ras_mgr/amdgpu_virt_ras_cmd.c +++ b/drivers/gpu/drm/amd/ras/ras_mgr/amdgpu_virt_ras_cmd.c @@ -264,7 +264,8 @@ static int amdgpu_virt_ras_get_cper_records(struct ras_core_context *ras_core, if (cmd->input_size != sizeof(struct ras_cmd_cper_record_req)) return RAS_CMD__ERROR_INVALID_INPUT_SIZE; - if (!req->buf_size || !req->buf_ptr || !req->cper_num) + if (!req->buf_size || !req->buf_ptr || !req->cper_num || + req->buf_size > RAS_CMD_MAX_CPER_BUF_SZ) return RAS_CMD__ERROR_INVALID_INPUT_DATA; trace = kzalloc_objs(*trace, MAX_RECORD_PER_BATCH); diff --git a/drivers/gpu/drm/amd/ras/rascore/ras_cmd.c b/drivers/gpu/drm/amd/ras/rascore/ras_cmd.c index 4f89810d85a1..8303aecf91ba 100644 --- a/drivers/gpu/drm/amd/ras/rascore/ras_cmd.c +++ b/drivers/gpu/drm/amd/ras/rascore/ras_cmd.c @@ -214,7 +214,8 @@ static int ras_cmd_get_cper_records(struct ras_core_context *ras_core, if (cmd->input_size != sizeof(struct ras_cmd_cper_record_req)) return RAS_CMD__ERROR_INVALID_INPUT_SIZE; - if (!req->buf_size || !req->buf_ptr || !req->cper_num) + if (!req->buf_size || !req->buf_ptr || !req->cper_num || + req->buf_size > RAS_CMD_MAX_CPER_BUF_SZ) return RAS_CMD__ERROR_INVALID_INPUT_DATA; buffer = kzalloc(req->buf_size, GFP_KERNEL); diff --git a/drivers/gpu/drm/amd/ras/rascore/ras_cmd.h b/drivers/gpu/drm/amd/ras/rascore/ras_cmd.h index 7ea35a028987..a1d4b8b02841 100644 --- a/drivers/gpu/drm/amd/ras/rascore/ras_cmd.h +++ b/drivers/gpu/drm/amd/ras/rascore/ras_cmd.h @@ -405,6 +405,9 @@ struct batch_ras_trace_info { #define RAS_CMD_MAX_BATCH_NUM 300 #define RAS_CMD_MAX_TRACE_NUM 300 + +/* Upper bounds for RAS_CMD__GET_CPER_RECORD to limit kernel allocations and work. */ +#define RAS_CMD_MAX_CPER_BUF_SZ (2 * 1024U * 1024U) /* 2 MiB */ struct ras_cmd_batch_trace_record_rsp { uint32_t version; uint16_t real_batch_num;