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Subject[PATCH 3.19.y-ckt 021/170] EDAC, amd64_edac: Shift wrapping issue in f1x_get_norm_dct_addr()
Date
3.19.8-ckt18 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 6f3508f61c814ee852c199988a62bd954c50dfc1 upstream.

dct_sel_base_off is declared as a u64 but we're only using the lower 32
bits because of a shift wrapping bug. This can possibly truncate the
upper 16 bits of DctSelBaseOffset[47:26], causing us to misdecode the CS
row.

Fixes: c8e518d5673d ('amd64_edac: Sanitize f10_get_base_addr_offset')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20160120095451.GB19898@mwanda
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/edac/amd64_edac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 5907c17..a3e482e 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1434,7 +1434,7 @@ static u64 f1x_get_norm_dct_addr(struct amd64_pvt *pvt, u8 range,
u64 chan_off;
u64 dram_base = get_dram_base(pvt, range);
u64 hole_off = f10_dhar_offset(pvt);
- u64 dct_sel_base_off = (pvt->dct_sel_hi & 0xFFFFFC00) << 16;
+ u64 dct_sel_base_off = (u64)(pvt->dct_sel_hi & 0xFFFFFC00) << 16;

if (hi_rng) {
/*
--
2.7.4
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