5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Baruch Siach <baruch@xxxxxxxxxx>
[ Upstream commit fa02de9e75889915b554eda1964a631fd019973b ]
The while loop condition verifies 'count < limit'. Neither value change
before the 'count >= limit' check. As is this check is dead code. But
code inspection reveals a code path that modifies 'count' and then goto
'drain_data' and back to 'read_again'. So there is a need to verify
count value sanity after 'read_again'.
Move 'read_again' up to fix the count limit check.
Fixes: ec222003bd94 ("net: stmmac: Prepare to add Split Header support")
Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
Reviewed-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Link: https://lore.kernel.org/r/d9486296c3b6b12ab3a0515fcd47d56447a07bfc.1699897370.git.baruch@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e521ab508f030..4eaa65e8d58f2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3536,10 +3536,10 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
len = 0;
}
+read_again:
if (count >= limit)
break;
-read_again:
buf1_len = 0;
buf2_len = 0;
entry = next_entry;
--
2.42.0
