5.4-stable review patch. If anyone has any objections, please let me know.
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From: Zijun Hu quic_zijuhu@quicinc.com
[ Upstream commit faeefc173be40512341b102cf1568aa0b6571acd ]
(assign|release)_proto_idx() wrongly check find_first_zero_bit() failure by condition '(prot->inuse_idx == PROTO_INUSE_NR - 1)' obviously.
Fix by correcting the condition to '(prot->inuse_idx == PROTO_INUSE_NR)'
Signed-off-by: Zijun Hu quic_zijuhu@quicinc.com Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Link: https://patch.msgid.link/20250410-fix_net-v2-1-d69e7c5739a4@quicinc.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/sock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c index a8359770fd93a..418d0857d2aaa 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -3370,7 +3370,7 @@ static int assign_proto_idx(struct proto *prot) { prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
- if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { + if (unlikely(prot->inuse_idx == PROTO_INUSE_NR)) { pr_err("PROTO_INUSE_NR exhausted\n"); return -ENOSPC; } @@ -3381,7 +3381,7 @@ static int assign_proto_idx(struct proto *prot)
static void release_proto_idx(struct proto *prot) { - if (prot->inuse_idx != PROTO_INUSE_NR - 1) + if (prot->inuse_idx != PROTO_INUSE_NR) clear_bit(prot->inuse_idx, proto_inuse_idx); } #else