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Wed, 04 Nov 2026 19:31:35 -0800 (PST) Date: Wed, 04 Nov 2026 19:31:35 -0800 In-Reply-To: <20261105033127.42105-1-eadavis@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aebf897.3487765f.14a015.0003.GAE@google.com> Subject: Re: [syzbot] [media?] [dri?] kernel BUG in sync_timeline_signal From: syzbot To: eadavis@sina.com Cc: eadavis@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" > From: Edward Aadm Davis > > #syz test "" does not look like a valid git branch or commit. > > diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h > index dd07d128adc3..4d885c8e1d4f 100644 > --- a/include/linux/dma-fence.h > +++ b/include/linux/dma-fence.h > @@ -320,8 +320,9 @@ static inline void dma_fence_put(struct dma_fence *fence) > static inline struct dma_fence *dma_fence_get(struct dma_fence *fence) > { > if (fence) > - kref_get(&fence->refcount); > - return fence; > + if (kref_get_unless_zero(&fence->refcount)) > + return fence; > + return NULL; > } > > /** > diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c > index 8df20b0218a9..ad60ad5e5cd9 100644 > --- a/drivers/dma-buf/sw_sync.c > +++ b/drivers/dma-buf/sw_sync.c > @@ -221,7 +221,8 @@ static void sync_timeline_signal(struct sync_timeline *obj, unsigned int inc) > if (!timeline_fence_signaled(&pt->base)) > break; > > - dma_fence_get(&pt->base); > + if (!dma_fence_get(&pt->base)) > + continue; > > list_move_tail(&pt->link, &signalled); > rb_erase(&pt->node, &obj->pt_tree);