* [PATCH] RDMA/usnic: Bound buffer size to sizeof(buf) in flowinfo_read()
@ 2026-10-17 18:50 Serhat Kumral
2026-10-17 18:53 ` sashiko-bot
0 siblings, 1 reply; 2+ messages in thread
From: Serhat Kumral @ 2026-10-17 18:50 UTC (permalink / raw)
To: Nelson Escobar, Satish Kharat, Jason Gunthorpe, Leon Romanovsky
Cc: linux-rdma, linux-kernel, Serhat Kumral
In flowinfo_read(), 'left' tracks the remaining space in the 512-byte
stack buffer 'buf', but it is initialized to 'count'.
Initialize 'left' to sizeof(buf) instead of 'count'.
Fixes: 9f637f793602 ("IB/usnic: Expose flows via debugfs")
Signed-off-by: Serhat Kumral <serhatkumral1@gmail.com>
---
found by smatch:
- drivers/infiniband/hw/usnic/usnic_debugfs.c:85 flowinfo_read() error: scnprintf() 'ptr' too small (512 vs 1000000000)
drivers/infiniband/hw/usnic/usnic_debugfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/usnic/usnic_debugfs.c b/drivers/infiniband/hw/usnic/usnic_debugfs.c
index 10a8cd5ba076..ece7c6e71499 100644
--- a/drivers/infiniband/hw/usnic/usnic_debugfs.c
+++ b/drivers/infiniband/hw/usnic/usnic_debugfs.c
@@ -76,7 +76,7 @@ static ssize_t flowinfo_read(struct file *f, char __user *data,
qp_flow = f->private_data;
ptr = buf;
- left = count;
+ left = sizeof(buf);
if (*ppos > 0)
return 0;
--
2.53.0
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2026-10-17 18:50 [PATCH] RDMA/usnic: Bound buffer size to sizeof(buf) in flowinfo_read() Serhat Kumral
2026-10-17 18:53 ` sashiko-bot
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