From: Sasha Neftin Date: Tue, 5 Apr 2022 15:56:01 +0000 (+0300) Subject: e1000e: Fix possible overflow in LTR decoding X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=56a160453083939d572f8074804492ff55a2e00d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git e1000e: Fix possible overflow in LTR decoding commit 04ebaa1cfddae5f240cc7404f009133bb0389a47 upstream. When we decode the latency and the max_latency, u16 value may not fit the required size and could lead to the wrong LTR representation. Scaling is represented as: scale 0 - 1 (2^(5*0)) = 2^0 scale 1 - 32 (2^(5 *1))= 2^5 scale 2 - 1024 (2^(5 *2)) =2^10 scale 3 - 32768 (2^(5 *3)) =2^15 scale 4 - 1048576 (2^(5 *4)) = 2^20 scale 5 - 33554432 (2^(5 *4)) = 2^25 scale 4 and scale 5 required 20 and 25 bits respectively. scale 6 reserved. Replace the u16 type with the u32 type and allow corrected LTR representation. Cc: stable@vger.kernel.org Fixes: 44a13a5d99c7 ("e1000e: Fix the max snoop/no-snoop latency for 10M") Reported-by: James Hutchinson Link: https://bugzilla.kernel.org/show_bug.cgi?id=215689 Suggested-by: Dima Ruinskiy Signed-off-by: Sasha Neftin Tested-by: Naama Meir Tested-by: James Hutchinson Signed-off-by: Tony Nguyen Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c index 9d5fe4ea9cee..60f0d2053a0a 100644 --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c @@ -1013,8 +1013,8 @@ static s32 e1000_platform_pm_pch_lpt(struct e1000_hw *hw, bool link) { u32 reg = link << (E1000_LTRV_REQ_SHIFT + E1000_LTRV_NOSNOOP_SHIFT) | link << E1000_LTRV_REQ_SHIFT | E1000_LTRV_SEND; - u16 max_ltr_enc_d = 0; /* maximum LTR decoded by platform */ - u16 lat_enc_d = 0; /* latency decoded */ + u32 max_ltr_enc_d = 0; /* maximum LTR decoded by platform */ + u32 lat_enc_d = 0; /* latency decoded */ u16 lat_enc = 0; /* latency encoded */ if (link) {