accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()

Currently, if find_and_map_user_pages() takes a DMA xfer request from the
user with a length field set to 0, or in a rare case, the host receives
QAIC_TRANS_DMA_XFER_CONT from the device where resources->xferred_dma_size
is equal to the requested transaction size, the function will return 0
before allocating an sgt or setting the fields of the dma_xfer struct.
In that case, encode_addr_size_pairs() will try to access the sgt which
will lead to a general protection fault.

Return an EINVAL in case the user provides a zero-sized ALP, or the device
requests continuation after all of the bytes have been transferred.

Fixes: 96d3c1cadedb ("accel/qaic: Clean up integer overflow checking in map_user_pages()")
Signed-off-by: Youssef Samir <quic_yabdulra@quicinc.com>
Signed-off-by: Youssef Samir <youssef.abdulrahman@oss.qualcomm.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Reviewed-by: Carl Vanderlip <carl.vanderlip@oss.qualcomm.com>
Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251007122320.339654-1-youssef.abdulrahman@oss.qualcomm.com

diff --git a/drivers/accel/qaic/qaic_control.c b/drivers/accel/qaic/qaic_control.c
index d8bdab69f800957ba5e431159d1372cde5107ee2..b86a8e48e731b7a604a25d9e9d664dcb21f5421c 100644 (file)
--- a/drivers/accel/qaic/qaic_control.c
+++ b/drivers/accel/qaic/qaic_control.c
@@ -407,7 +407,7 @@ static int find_and_map_user_pages(struct qaic_device *qdev,
                return -EINVAL;
        remaining = in_trans->size - resources->xferred_dma_size;
        if (remaining == 0)
-               return 0;
+               return -EINVAL;
 
        if (check_add_overflow(xfer_start_addr, remaining, &end))
                return -EINVAL;