| From | Kamal Mostafa <> | Subject | [PATCH 3.19.y-ckt 021/170] EDAC, amd64_edac: Shift wrapping issue in f1x_get_norm_dct_addr() | Date | Fri, 1 Apr 2016 17:51:47 -0700 |
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3.19.8-ckt18 -stable review patch. If anyone has any objections, please let me know.
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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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