This is a note to let you know that I've just added the patch titled
wifi: ath11k: fix writing to unintended memory region
to the 6.2-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-ath11k-fix-writing-to-unintended-memory-region.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6c389e0d1fd03d3a07eb7947800437be285254db
Author: P Praneesh <quic_ppranees@xxxxxxxxxxx>
Date: Fri Mar 24 16:57:01 2023 +0200
wifi: ath11k: fix writing to unintended memory region
[ Upstream commit 756a7f90878f0866fd2fe167ef37e90b47326b96 ]
While initializing spectral, the magic value is getting written to the
invalid memory address leading to random boot-up crash. This occurs
due to the incorrect index increment in ath11k_dbring_fill_magic_value
function. Fix it by replacing the existing logic with memset32 to ensure
there is no invalid memory access.
Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.4.0.1-01838-QCAHKSWPL_SILICONZ-1
Fixes: d3d358efc553 ("ath11k: add spectral/CFR buffer validation support")
Signed-off-by: P Praneesh <quic_ppranees@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230321052900.16895-1-quic_ppranees@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath11k/dbring.c b/drivers/net/wireless/ath/ath11k/dbring.c
index 2107ec05d14fd..5536e86423312 100644
--- a/drivers/net/wireless/ath/ath11k/dbring.c
+++ b/drivers/net/wireless/ath/ath11k/dbring.c
@@ -26,13 +26,13 @@ int ath11k_dbring_validate_buffer(struct ath11k *ar, void *buffer, u32 size)
static void ath11k_dbring_fill_magic_value(struct ath11k *ar,
void *buffer, u32 size)
{
- u32 *temp;
- int idx;
-
- size = size >> 2;
+ /* memset32 function fills buffer payload with the ATH11K_DB_MAGIC_VALUE
+ * and the variable size is expected to be the number of u32 values
+ * to be stored, not the number of bytes.
+ */
+ size = size / sizeof(u32);
- for (idx = 0, temp = buffer; idx < size; idx++, temp++)
- *temp++ = ATH11K_DB_MAGIC_VALUE;
+ memset32(buffer, ATH11K_DB_MAGIC_VALUE, size);
}
static int ath11k_dbring_bufs_replenish(struct ath11k *ar,
