From: Hyunwoo Kim imv4bel@gmail.com

mainline inclusion from mainline-v5.19-rc4 commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5PRMO CVE: CVE-2022-39842

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In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of type int. Then, copy_from_user() may cause a heap overflow because it is used as the third argument of copy_from_user().

Signed-off-by: Hyunwoo Kim imv4bel@gmail.com Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Zhao Wenhui zhaowenhui8@huawei.com Reviewed-by: Chen Hui judy.chenhui@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/video/fbdev/pxa3xx-gcu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c index 69cfb337c857..6fe5573e2008 100644 --- a/drivers/video/fbdev/pxa3xx-gcu.c +++ b/drivers/video/fbdev/pxa3xx-gcu.c @@ -394,7 +394,7 @@ pxa3xx_gcu_write(struct file *file, const char *buff, struct pxa3xx_gcu_batch *buffer; struct pxa3xx_gcu_priv *priv = to_pxa3xx_gcu_priv(file);

- int words = count / 4; + size_t words = count / 4;

/* Does not need to be atomic. There's a lock in user space, * but anyhow, this is just for statistics. */