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net: atlantic: fix double free in ring reinit logic

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Driver has a logic leak in ring data allocation/free,
where double free may happen in aq_ring_free if system is under
stress and driver init/deinit is happening.

The probability is higher to get this during suspend/resume cycle.

Verification was done simulating same conditions with

    stress -m 2000 --vm-bytes 20M --vm-hang 10 --backoff 1000
    while true; do sudo ifconfig enp1s0 down; sudo ifconfig enp1s0 up; done

Fixed by explicitly clearing pointers to NULL on deallocation

Fixes: 018423e90b ("net: ethernet: aquantia: Add ring support code")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Closes: https://lore.kernel.org/netdev/CAHk-=wiZZi7FcvqVSUirHBjx0bBUZ4dFrMDVLc3+3HCrtq0rBA@mail.gmail.com/
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Link: https://lore.kernel.org/r/20231213094044.22988-1-irusskikh@marvell.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Igor Russkikh 2023-12-13 10:40:44 +01:00 committed by Paolo Abeni
parent 189ff16722
commit 7bb26ea74a
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/aquantia/atlantic/aq_ring.c
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@ -938,11 +938,14 @@ void aq_ring_free(struct aq_ring_s *self)
return;
kfree(self->buff_ring);
self->buff_ring = NULL;
if (self->dx_ring)
if (self->dx_ring) {
dma_free_coherent(aq_nic_get_dev(self->aq_nic),
self->size * self->dx_size, self->dx_ring,
self->dx_ring_pa);
self->dx_ring = NULL;
}
}
unsigned int aq_ring_fill_stats_data(struct aq_ring_s *self, u64 *data)