From: Jozef Hopko <jozef.hopko@xxxxxxxxxx>
Commit 205c50306acf ("wifi: wilc1000: fix RCU usage in connect path")
made sure that the IEs data was manipulated under the relevant RCU section.
Unfortunately, while doing so, the commit brought a faulty implicit cast
from int to u8 on the ies_len variable, making the parsing fail to be
performed correctly if the IEs block is larger than 255 bytes. This failure
can be observed with Access Points appending a lot of IEs TLVs in their
beacon frames (reproduced with a Pixel phone acting as an Access Point,
which brough 273 bytes of IE data in my testing environment).
Fix IEs parsing by removing this undesired implicit cast.
Fixes: 205c50306acf ("wifi: wilc1000: fix RCU usage in connect path")
Signed-off-by: Jozef Hopko <jozef.hopko@xxxxxxxxxx>
Signed-off-by: Alexis Lothoré <alexis.lothore@xxxxxxxxxxx>
---
The issue has been initially detected by Jozef Hopko, and the resulting
patch is also from him. He asked me to upstream it on his behalf. I have
successfuly reproduced the same issue and confirmed that the patch indeed
fixes the connection to the AP I used. The only update I did is about
adding details about the issue in commit message and fixing whitespaces.
The issue has been disclosed to me directly through private mail, so I have
no relevant Reported-By/Closes tag to provide. I am not sure however why I
do not manage to make sparse detect this faulty cast.
---
drivers/net/wireless/microchip/wilc1000/hif.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/microchip/wilc1000/hif.c b/drivers/net/wireless/microchip/wilc1000/hif.c
index d67293142ffb..3c48e1a57b24 100644
--- a/drivers/net/wireless/microchip/wilc1000/hif.c
+++ b/drivers/net/wireless/microchip/wilc1000/hif.c
@@ -382,7 +382,8 @@ wilc_parse_join_bss_param(struct cfg80211_bss *bss,
struct ieee80211_p2p_noa_attr noa_attr;
const struct cfg80211_bss_ies *ies;
struct wilc_join_bss_param *param;
- u8 rates_len = 0, ies_len;
+ u8 rates_len = 0;
+ int ies_len;
int ret;
param = kzalloc(sizeof(*param), GFP_KERNEL);
---
base-commit: 21cfb73516c112f0cf0d3ebd3e4bdfbadc819576
change-id: 20240701-wilc_fix_ies_data-22226322ee7c
Best regards,
--
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
