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video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write

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[ Upstream commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hyunwoo Kim 2022-06-20 07:17:46 -07:00 committed by Greg Kroah-Hartman
parent 47c5ef29e5
commit 1878eaf0ed
1 changed files with 1 additions and 1 deletions
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drivers/video/fbdev/pxa3xx-gcu.c
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@ -382,7 +382,7 @@ 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. */