From 9525d169e5fd481538cf8c663cc5839e54f2e481 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ma=C3=ADra=20Canal?= Date: Mon, 30 Mar 2026 14:51:45 -0300 Subject: [PATCH] drm/vc4: Fix a memory leak in hang state error path MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When vc4_save_hang_state() encounters an early return condition, it returns without freeing the previously allocated `kernel_state`, leaking memory. Add the missing kfree() calls by consolidating the early return paths into a single place. Fixes: 214613656b51 ("drm/vc4: Add an interface for capturing the GPU state after a hang.") Reviewed-by: Melissa Wen Link: https://patch.msgid.link/20260330-vc4-misc-fixes-v1-3-92defc940a29@igalia.com Signed-off-by: Maíra Canal --- drivers/gpu/drm/vc4/vc4_gem.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index a64d5a962452..34bdac107ce1 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -171,10 +171,8 @@ vc4_save_hang_state(struct drm_device *dev) spin_lock_irqsave(&vc4->job_lock, irqflags); exec[0] = vc4_first_bin_job(vc4); exec[1] = vc4_first_render_job(vc4); - if (!exec[0] && !exec[1]) { - spin_unlock_irqrestore(&vc4->job_lock, irqflags); - return; - } + if (!exec[0] && !exec[1]) + goto err_free_state; /* Get the bos from both binner and renderer into hang state. */ state->bo_count = 0; @@ -191,10 +189,8 @@ vc4_save_hang_state(struct drm_device *dev) kernel_state->bo = kzalloc_objs(*kernel_state->bo, state->bo_count, GFP_ATOMIC); - if (!kernel_state->bo) { - spin_unlock_irqrestore(&vc4->job_lock, irqflags); - return; - } + if (!kernel_state->bo) + goto err_free_state; k = 0; for (i = 0; i < 2; i++) { @@ -286,6 +282,12 @@ vc4_save_hang_state(struct drm_device *dev) vc4->hang_state = kernel_state; spin_unlock_irqrestore(&vc4->job_lock, irqflags); } + + return; + +err_free_state: + spin_unlock_irqrestore(&vc4->job_lock, irqflags); + kfree(kernel_state); } static void