From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp
mainline inclusion from mainline-v6.10-rc2 commit b794918961516f667b0c745aebdfebbb8a98df39 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7DBQ CVE: CVE-2024-38780
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Since commit a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") by error replaced spin_unlock_irqrestore() with spin_unlock_irq() for both sync_debugfs_show() and sync_print_obj() despite sync_print_obj() is called from sync_debugfs_show(), lockdep complains inconsistent lock state warning.
Use plain spin_{lock,unlock}() for sync_print_obj(), for sync_debugfs_show() is already using spin_{lock,unlock}_irq().
Reported-by: syzbot syzbot+a225ee3df7e7f9372dbe@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=a225ee3df7e7f9372dbe Fixes: a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Reviewed-by: Christian König christian.koenig@amd.com Link: https://patchwork.freedesktop.org/patch/msgid/c2e46020-aaa6-4e06-bf73-f05823... Signed-off-by: Christian König christian.koenig@amd.com Signed-off-by: Zheng Zucheng zhengzucheng@huawei.com --- drivers/dma-buf/sync_debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c index 101394f16930..237bce21d1e7 100644 --- a/drivers/dma-buf/sync_debug.c +++ b/drivers/dma-buf/sync_debug.c @@ -110,12 +110,12 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
seq_printf(s, "%s: %d\n", obj->name, obj->value);
- spin_lock_irq(&obj->lock); + spin_lock(&obj->lock); /* Caller already disabled IRQ. */ list_for_each(pos, &obj->pt_list) { struct sync_pt *pt = container_of(pos, struct sync_pt, link); sync_print_fence(s, &pt->base, false); } - spin_unlock_irq(&obj->lock); + spin_unlock(&obj->lock); }
static void sync_print_sync_file(struct seq_file *s,