RDMA/core: Fix ib block iterator counter overflow

[ Upstream commit 0afec5e9cea732cb47014655685a2a47fb180c31 ]

When registering a new DMA MR after selecting the best aligned page size
for it, we iterate over the given sglist to split each entry to smaller,
aligned to the selected page size, DMA blocks.

In given circumstances where the sg entry and page size fit certain
sizes and the sg entry is not aligned to the selected page size, the
total size of the aligned pages we need to cover the sg entry is >= 4GB.
Under this circumstances, while iterating page aligned blocks, the
counter responsible for counting how much we advanced from the start of
the sg entry is overflowed because its type is u32 and we pass 4GB in
size. This can lead to an infinite loop inside the iterator function
because the overflow prevents the counter to be larger
than the size of the sg entry.

Fix the presented problem by changing the advancement condition to
eliminate overflow.

Backtrace:
[  192.374329] efa_reg_user_mr_dmabuf
[  192.376783] efa_register_mr
[  192.382579] pgsz_bitmap 0xfffff000 rounddown 0x80000000
[  192.386423] pg_sz [0x80000000] umem_length[0xc0000000]
[  192.392657] start 0x0 length 0xc0000000 params.page_shift 31 params.page_num 3
[  192.399559] hp_cnt[3], pages_in_hp[524288]
[  192.403690] umem->sgt_append.sgt.nents[1]
[  192.407905] number entries: [1], pg_bit: [31]
[  192.411397] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.415601] biter->__sg_advance [665837568] sg_dma_len[3221225472]
[  192.419823] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.423976] biter->__sg_advance [2813321216] sg_dma_len[3221225472]
[  192.428243] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.432397] biter->__sg_advance [665837568] sg_dma_len[3221225472]

Fixes: 85e81aacff8e ("RDMA/verbs: Add a DMA iterator to return aligned contiguous memory blocks")
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
Link: https://lore.kernel.org/r/20230109133711.13678-1-ynachum@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 5d896f6b2b617bec63ca24e4b9d47f8c1b70e26c..93a7ff1bd02c79794770c22097417e24ab9ef122 100644 (file)
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -2840,15 +2840,18 @@ EXPORT_SYMBOL(__rdma_block_iter_start);
 bool __rdma_block_iter_next(struct ib_block_iter *biter)
 {
        unsigned int block_offset;
+       unsigned int sg_delta;
 
        if (!biter->__sg_nents || !biter->__sg)
                return false;
 
        biter->__dma_addr = sg_dma_address(biter->__sg) + biter->__sg_advance;
        block_offset = biter->__dma_addr & (BIT_ULL(biter->__pg_bit) - 1);
-       biter->__sg_advance += BIT_ULL(biter->__pg_bit) - block_offset;
+       sg_delta = BIT_ULL(biter->__pg_bit) - block_offset;
 
-       if (biter->__sg_advance >= sg_dma_len(biter->__sg)) {
+       if (sg_dma_len(biter->__sg) - biter->__sg_advance > sg_delta) {
+               biter->__sg_advance += sg_delta;
+       } else {
                biter->__sg_advance = 0;
                biter->__sg = sg_next(biter->__sg);
                biter->__sg_nents--;