In function ath10k_sdio_mbox_rx_alloc() [sdio.c],
ath10k_sdio_mbox_alloc_rx_pkt() is called without handling the error cases.
This will make the driver think the allocation for skb is successful and
try to access the skb. If we enable failslab, system will easily crash with
NULL pointer dereferencing.
Call trace of CONFIG_FAILSLAB:
ath10k_sdio_irq_handler+0x570/0xa88 [ath10k_sdio]
process_sdio_pending_irqs+0x4c/0x174
sdio_run_irqs+0x3c/0x64
sdio_irq_work+0x1c/0x28
Fixes: d96db25d2025 ("ath10k: add initial SDIO support")
Signed-off-by: Claire Chang <tientzu@xxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath10k/sdio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index 9bbd5b54b8ca..4b7f1c6f13e2 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -607,6 +607,10 @@ static int ath10k_sdio_mbox_rx_alloc(struct ath10k *ar,
full_len,
last_in_bundle,
last_in_bundle);
+ if (ret) {
+ ath10k_warn(ar, "alloc_rx_pkt error %d\n", ret);
+ goto err;
+ }
}
ar_sdio->n_rx_pkts = i;
--
2.21.0.1020.gf2820cf01a-goog
