From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp
commit 3c3bfb8586f848317ceba5d777e11204ba3e5758 upstream.
syzbot is reporting memory leak at fbcon_do_set_font() [1], for commit a5a923038d70 ("fbdev: fbcon: Properly revert changes when vc_resize() failed") missed that the buffer might be newly allocated by fbcon_set_font().
Link: https://syzkaller.appspot.com/bug?extid=25bdb7b1703639abd498 [1] Reported-by: syzbot syzbot+25bdb7b1703639abd498@syzkaller.appspotmail.com Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Tested-by: syzbot syzbot+25bdb7b1703639abd498@syzkaller.appspotmail.com Fixes: a5a923038d70 ("fbdev: fbcon: Properly revert changes when vc_resize() failed") CC: stable@vger.kernel.org # 5.15+ Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/video/fbdev/core/fbcon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -2462,7 +2462,8 @@ err_out:
if (userfont) { p->userfont = old_userfont; - REFCOUNT(data)--; + if (--REFCOUNT(data) == 0) + kfree(data - FONT_EXTRA_WORDS * sizeof(int)); }
vc->vc_font.width = old_width;