[PATCH 5.13 049/300] m68k: emu: Fix invalid free in nfeth_cleanup()

Greg Kroah-Hartman
2021-09-13T13:55:28Z

From: Pavel Skripkin <paskripkin@gmail.com>

[ Upstream commit 761608f5cf70e8876c2f0e39ca54b516bdcb7c12 ]

In the for loop all nfeth_dev array members should be freed, not only
the first one. Freeing only the first array member can cause
double-free bugs and memory leaks.

Fixes: 9cd7b148312f ("m68k/atari: ARAnyM - Add support for network access")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210705204727.10743-1-paskripkin@gmail.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/m68k/emu/nfeth.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/emu/nfeth.c b/arch/m68k/emu/nfeth.c
index d2875e32abfc..79e55421cfb1 100644
--- a/arch/m68k/emu/nfeth.c
+++ b/arch/m68k/emu/nfeth.c
@@ -254,8 +254,8 @@ static void __exit nfeth_cleanup(void)

for (i = 0; i < MAX_UNIT; i++) {
if (nfeth_dev[i]) {
- unregister_netdev(nfeth_dev[0]);
- free_netdev(nfeth_dev[0]);
+ unregister_netdev(nfeth_dev[i]);
+ free_netdev(nfeth_dev[i]);
}
}
free_irq(nfEtherIRQ, nfeth_interrupt);
--
2.30.2