EDAC/{skx_common,skx}: Fix UBSAN shift-out-of-bounds in skx_get_dimm_info

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[ Upstream commit c63ed6e1f5 ]

When the skx_get_dimm_attr() helper returns -EINVAL,
skx_get_dimm_info() does not validate these return values before using
them in a shift operation:

    size = ((1ull << (rows + cols + ranks)) * banks) >> (20 - 3);

If all three values are -22, the shift exponent becomes -66, triggering
a UBSAN shift-out-of-bounds error:

    UBSAN: shift-out-of-bounds in drivers/edac/skx_common.c
    shift exponent -66 is negative

Fixes: 88a242c987 ("EDAC, skx_common: Separate common code out from skx_edac")
Signed-off-by: zhoumin <teczm@foxmail.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://patch.msgid.link/tencent_2A0CC835A18366643CBD2865B169948AB409@qq.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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zhoumin 2026-03-26 17:14:03 +08:00 • committed by Greg Kroah-Hartman

parent 77b6fc9835

commit 31b16ed562

1 changed files with 3 additions and 0 deletions

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drivers/edac/skx_common.c

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