commit f956052e00de211b5c9ebaa1958366c23f82ee9e upstream.
font.data may not initialize all memory spaces depending on the implementation of vc->vc_sw->con_font_get. This may cause info-leak, so to prevent this, it is safest to modify it to initialize the allocated memory space to 0, and it generally does not affect the overall performance of the system.
Cc: stable@vger.kernel.org Reported-by: syzbot+955da2d57931604ee691@syzkaller.appspotmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Jeongjun Park aha310510@gmail.com Link: https://lore.kernel.org/r/20241010174619.59662-1-aha310510@gmail.com --- drivers/tty/vt/vt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 5f1183b0b89d..800979e8d5b6 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -4398,7 +4398,7 @@ static int con_font_get(struct vc_data *vc, struct console_font_op *op) int c;
if (op->data) { - font.data = kmalloc(max_font_size, GFP_KERNEL); + font.data = kzalloc(max_font_size, GFP_KERNEL); if (!font.data) return -ENOMEM; } else --