sfr->buf_size is in shared memory and can be modified by malicious user.
OOB write is possible when the size is made higher than actual sfr data
buffer. Cap the size to allocated size for such cases.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files")
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
Signed-off-by: Vikash Garodia <quic_vgarodia@xxxxxxxxxxx>
---
drivers/media/platform/qcom/venus/hfi_venus.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 6b615270c5dae470c6fad408c9b5bc037883e56e..c3113420d266e61fcab44688580288d7408b50f4 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -1041,18 +1041,23 @@ static void venus_sfr_print(struct venus_hfi_device *hdev)
{
struct device *dev = hdev->core->dev;
struct hfi_sfr *sfr = hdev->sfr.kva;
+ u32 size;
void *p;
if (!sfr)
return;
- p = memchr(sfr->data, '\0', sfr->buf_size);
+ size = sfr->buf_size;
+ if (size > ALIGNED_SFR_SIZE)
+ size = ALIGNED_SFR_SIZE;
+
+ p = memchr(sfr->data, '\0', size);
/*
* SFR isn't guaranteed to be NULL terminated since SYS_ERROR indicates
* that Venus is in the process of crashing.
*/
if (!p)
- sfr->data[sfr->buf_size - 1] = '\0';
+ sfr->data[size - 1] = '\0';
dev_err_ratelimited(dev, "SFR message from FW: %s\n", sfr->data);
}
--
2.34.1
