5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yonatan Nachum [ Upstream commit 229b42d7450c1cf96f45ec39ebb69211b06bc036 ] On register MR, when creating the PBL, if it's an indirect PBL we create a chunk list to hold the PBL pages pointers. Each chunk is 4KB in size and can hold 510 addresses (EFA_PTRS_PER_CHUNK) and has a 12-byte control buffer at the end of it holding the next chunk's pointer and its length. If the PBL number of pages is a multiple of EFA_PTRS_PER_CHUNK, the calculated last chunk length is wrongly computed as 0, even though that chunk is fully populated with 510 real page pointers. This wrong length is used both to DMA map the chunk and is propagated to the device, causing the device to see the chunk as empty and reject the memory registration. Fix the calculation so it will be performed only if the number of pages isn't a multiple of EFA_PTRS_PER_CHUNK, if it is, its already handled in the above loop correctly. Also prevent out-of-bounds reach in the chunks array in such scenario. Fixes: 40909f664d27 ("RDMA/efa: Add EFA verbs implementation") Reviewed-by: Firas Jahjah Reviewed-by: Michael Margolin Signed-off-by: Yonatan Nachum Link: https://patch.msgid.link/20260727090255.1175120-1-ynachum@amazon.com Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/hw/efa/efa_verbs.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c index 15086856581f7..3cb1aebae7006 100644 --- a/drivers/infiniband/hw/efa/efa_verbs.c +++ b/drivers/infiniband/hw/efa/efa_verbs.c @@ -1217,9 +1217,11 @@ static int pbl_chunk_list_create(struct efa_dev *dev, struct pbl_context *pbl) chunk_list->chunks[i].length = EFA_CHUNK_USED_SIZE; } - chunk_list->chunks[chunk_list_size - 1].length = - ((page_cnt % EFA_PTRS_PER_CHUNK) * EFA_CHUNK_PAYLOAD_PTR_SIZE) + - EFA_CHUNK_PTR_SIZE; + + if (page_cnt % EFA_PTRS_PER_CHUNK != 0) + chunk_list->chunks[chunk_list_size - 1].length = + ((page_cnt % EFA_PTRS_PER_CHUNK) * EFA_CHUNK_PAYLOAD_PTR_SIZE) + + EFA_CHUNK_PTR_SIZE; /* fill the dma addresses of sg list pages to chunks: */ chunk_idx = 0; @@ -1231,9 +1233,12 @@ static int pbl_chunk_list_create(struct efa_dev *dev, struct pbl_context *pbl) rdma_block_iter_dma_address(&biter); if (payload_idx == EFA_PTRS_PER_CHUNK) { + payload_idx = 0; chunk_idx++; + if (chunk_idx >= chunk_list_size) + break; + cur_chunk_buf = chunk_list->chunks[chunk_idx].buf; - payload_idx = 0; } } -- 2.53.0