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[next] ath11k: fix missing error check on call to ath11k_pci_get_user_msi_assignment

Message ID 20200819111452.52419-1-colin.king@canonical.com
State New
Headers show
Series [next] ath11k: fix missing error check on call to ath11k_pci_get_user_msi_assignment | expand

Commit Message

Colin King Aug. 19, 2020, 11:14 a.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

The return error check on the call to ath11k_pci_get_user_msi_assignment is
missing.  If an error does occur, num_vectors is still set to zero and
later on a division by zero can occur when variable vector is being
calculated.  Fix this by adding an error check after the call.

Addresses-Coverity: ("Division or modulo by zero")
Fixes: d4ecb90b3857 ("ath11k: enable DP interrupt setup for QCA6390")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/ath/ath11k/pci.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index ca7012d46c3f..058885776a3a 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -648,9 +648,12 @@  static int ath11k_pci_ext_irq_config(struct ath11k_base *ab)
 	int i, j, ret, num_vectors = 0;
 	u32 user_base_data = 0, base_vector = 0;
 
-	ath11k_pci_get_user_msi_assignment(ath11k_pci_priv(ab), "DP",
-					   &num_vectors, &user_base_data,
-					   &base_vector);
+	ret = ath11k_pci_get_user_msi_assignment(ath11k_pci_priv(ab), "DP",
+						 &num_vectors,
+						 &user_base_data,
+						 &base_vector);
+	if (ret < 0)
+		return ret;
 
 	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
 		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];