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igb: Fix use-after-free error during reset

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[ Upstream commit 7b292608db23ccbbfbfa50cdb155d01725d7a52e ]

Cleans the next descriptor to watch (next_to_watch) when cleaning the
TX ring.

Failure to do so can cause invalid memory accesses. If igb_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: 7cc6fd4c60 ("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>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vinicius Costa Gomes 2021-05-13 17:31:04 -07:00 committed by Greg Kroah-Hartman
parent e15f629036
commit f153664d8e
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/intel/igb/igb_main.c
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@ -4836,6 +4836,8 @@ static void igb_clean_tx_ring(struct igb_ring *tx_ring)
DMA_TO_DEVICE);
}
tx_buffer->next_to_watch = NULL;
/* move us one more past the eop_desc for start of next pkt */
tx_buffer++;
i++;