From: Yajun Deng Date: Wed, 16 Aug 2023 08:33:05 +0000 (+0800) Subject: ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans X-Git-Tag: v6.15-rc1~17^2~6 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=de203da734fae00e75be50220ba5391e7beecdf9;p=linux-block.git ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans There is a kernel API ntb_mw_clear_trans() would pass 0 to both addr and size. This would make xlate_pos negative. [ 23.734156] switchtec switchtec0: MW 0: part 0 addr 0x0000000000000000 size 0x0000000000000000 [ 23.734158] ================================================================================ [ 23.734172] UBSAN: shift-out-of-bounds in drivers/ntb/hw/mscc/ntb_hw_switchtec.c:293:7 [ 23.734418] shift exponent -1 is negative Ensuring xlate_pos is a positive or zero before BIT. Fixes: 1e2fd202f859 ("ntb_hw_switchtec: Check for alignment of the buffer in mw_set_trans()") Signed-off-by: Yajun Deng Reviewed-by: Logan Gunthorpe Signed-off-by: Jon Mason --- diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c index ad1786be2554..f851397b65d6 100644 --- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c @@ -288,7 +288,7 @@ static int switchtec_ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx, if (size != 0 && xlate_pos < 12) return -EINVAL; - if (!IS_ALIGNED(addr, BIT_ULL(xlate_pos))) { + if (xlate_pos >= 0 && !IS_ALIGNED(addr, BIT_ULL(xlate_pos))) { /* * In certain circumstances we can get a buffer that is * not aligned to its size. (Most of the time