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| author | Vinicius Costa Gomes <vinicius.gomes@intel.com> | 2021-05-13 17:31:04 -0700 |
|---|---|---|
| committer | Tony Nguyen <anthony.l.nguyen@intel.com> | 2021-07-01 10:53:04 -0700 |
| commit | 7b292608db23ccbbfbfa50cdb155d01725d7a52e (patch) | |
| tree | aaf9e657a3986864c24fe0d29854ff9eb2eefefe /drivers | |
| parent | 56ea7ed103b46970e171eb1c95916f393d64eeff (diff) | |
| download | linux-stable-7b292608db23ccbbfbfa50cdb155d01725d7a52e.tar.gz linux-stable-7b292608db23ccbbfbfa50cdb155d01725d7a52e.tar.bz2 linux-stable-7b292608db23ccbbfbfa50cdb155d01725d7a52e.zip | |
igb: Fix use-after-free error during reset
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: 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>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 7e6435dc7e80..a61e2e5e95c0 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -4835,6 +4835,8 @@ 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++; |