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[net-queue,v1,2/2] igb: Fix user-after-free error during reset

Message ID 20210514003104.1360697-2-vinicius.gomes@intel.com
State Under Review
Delegated to: Anthony Nguyen
Headers show
Series [net-queue,v1,1/2] igc: Fix user-after-free error during reset | expand

Commit Message

Vinicius Costa Gomes May 14, 2021, 12:31 a.m. UTC
Cleans the next descriptor to watch (next_to_watch) when cleaning the
TX ring.

Failure to do so can cause invalid memory accesses. If igc_poll() runs
while the controller is reset this can lead to the driver try to free
a skb that was already freed.

(The crash is harder to reproduce with the igb driver, but the same
potential problem exists as the code is identical to igc)

Fixes: 7cc6fd4c60f2 ("igb: Don't bother clearing Tx buffer_info in igb_clean_tx_ring")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reported-by: Erez Geva <erez.geva.ext@siemens.com>
 drivers/net/ethernet/intel/igb/igb_main.c | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index fb3d69586db7..7d1b97f1deef 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4841,6 +4841,8 @@  static void igb_clean_tx_ring(struct igb_ring *tx_ring)
+		tx_buffer->next_to_watch = NULL;
 		/* move us one more past the eop_desc for start of next pkt */