4.9-stable review patch. If anyone has any objections, please let me know.
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From: Dedy Lansky qca_dlansky@qca.qualcomm.com
[ Upstream commit 0f6edfe2bbbb59d161580cb4870fcc46f5490f85 ]
In case count is not multiple of 4, there is a read access in wil_memcpy_toio_32() from outside src buffer boundary. In wil_memcpy_fromio_32(), in case count is not multiple of 4, there is a write access to outside dst io memory boundary.
Fix these issues with proper handling of the last 1 to 4 copied bytes.
Signed-off-by: Dedy Lansky qca_dlansky@qca.qualcomm.com Signed-off-by: Maya Erez qca_merez@qca.qualcomm.com Signed-off-by: Kalle Valo kvalo@qca.qualcomm.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/wireless/ath/wil6210/main.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-)
--- a/drivers/net/wireless/ath/wil6210/main.c +++ b/drivers/net/wireless/ath/wil6210/main.c @@ -129,9 +129,15 @@ void wil_memcpy_fromio_32(void *dst, con u32 *d = dst; const volatile u32 __iomem *s = src;
- /* size_t is unsigned, if (count%4 != 0) it will wrap */ - for (count += 4; count > 4; count -= 4) + for (; count >= 4; count -= 4) *d++ = __raw_readl(s++); + + if (unlikely(count)) { + /* count can be 1..3 */ + u32 tmp = __raw_readl(s); + + memcpy(d, &tmp, count); + } }
void wil_memcpy_fromio_halp_vote(struct wil6210_priv *wil, void *dst, @@ -148,8 +154,16 @@ void wil_memcpy_toio_32(volatile void __ volatile u32 __iomem *d = dst; const u32 *s = src;
- for (count += 4; count > 4; count -= 4) + for (; count >= 4; count -= 4) __raw_writel(*s++, d++); + + if (unlikely(count)) { + /* count can be 1..3 */ + u32 tmp = 0; + + memcpy(&tmp, s, count); + __raw_writel(tmp, d); + } }
void wil_memcpy_toio_halp_vote(struct wil6210_priv *wil,