[PATCH io_uring-7.1 2/4] io_uring/zcrx: don't clear not allocated niovs
From: Pavel Begunkov <asml.silence@gmail.com>
Date: 2026-03-25 12:08:20
Also in:
io-uring
Subsystem:
io_uring, io_uring zcrx, the rest · Maintainers:
Jens Axboe, Pavel Begunkov, Linus Torvalds
Now that area->is_mapped is set earlier before niovs array is allocated,
io_zcrx_free_area -> io_zcrx_unmap_area in an error path can try to
clear dma addresses for unallocated niovs, fix it.
Fixes: 8c0cab0b7bf76 ("always dma map in advance")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
io_uring/zcrx.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 695398d2f2e0..fc6199edad34 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c@@ -289,8 +289,10 @@ static void io_zcrx_unmap_area(struct io_zcrx_ifq *ifq, return; area->is_mapped = false; - for (i = 0; i < area->nia.num_niovs; i++) - net_mp_niov_set_dma_addr(&area->nia.niovs[i], 0); + if (area->nia.niovs) { + for (i = 0; i < area->nia.num_niovs; i++) + net_mp_niov_set_dma_addr(&area->nia.niovs[i], 0); + } if (area->mem.is_dmabuf) { io_release_dmabuf(&area->mem);
--
2.53.0