This is a note to let you know that I've just added the patch titled
wifi: iwlwifi: yoyo: Fix possible division by zero
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-iwlwifi-yoyo-fix-possible-division-by-zero.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e04191f6aae2def3fb1d6096fd39ab377f1e9efe
Author: Daniel Gabay <daniel.gabay@xxxxxxxxx>
Date: Thu Apr 13 21:40:34 2023 +0300
wifi: iwlwifi: yoyo: Fix possible division by zero
[ Upstream commit ba30415118eee374a08b39a0460a1d1e52c24a25 ]
Don't allow buffer allocation TLV with zero req_size since it
leads later to division by zero in iwl_dbg_tlv_alloc_fragments().
Also, NPK/SRAM locations are allowed to have zero buffer req_size,
don't discard them.
Fixes: a9248de42464 ("iwlwifi: dbg_ini: add TLV allocation new API support")
Signed-off-by: Daniel Gabay <daniel.gabay@xxxxxxxxx>
Signed-off-by: Gregory Greenman <gregory.greenman@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230413213309.5d6688ed74d8.I5c2f3a882b50698b708d54f4524dc5bdf11e3d32@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
index fc4197bf2478e..f9bd081dd9e08 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
@@ -134,6 +134,12 @@ static int iwl_dbg_tlv_alloc_buf_alloc(struct iwl_trans *trans,
alloc_id != IWL_FW_INI_ALLOCATION_ID_DBGC1)
goto err;
+ if (buf_location == IWL_FW_INI_LOCATION_DRAM_PATH &&
+ alloc->req_size == 0) {
+ IWL_ERR(trans, "WRT: Invalid DRAM buffer allocation requested size (0)\n");
+ return -EINVAL;
+ }
+
trans->dbg.fw_mon_cfg[alloc_id] = *alloc;
return 0;
