CVE-2026-97477RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind()

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind() When __rdma_counter_bind_qp() fails in alloc_and_bind(), the error path jumps to err_mode which frees the counter without decrementing port_counter->num_counters. The only place that decrements is rdma_counter_free(), which is unreachable since the counter was never successfully bound. This leak accumulates across repeated failures, permanently preventing the port from switching to AUTO mode (-EBUSY in __counter_set_mode()) and blocking the MANUAL→NONE auto-revert in rdma_counter_free(). When the mode was NONE before the call, the MANUAL mode set by __counter_set_mode() also leaks since the revert logic is never reached. Add an err_bind label between the num_counters increment and the existing err_mode label. It decrements num_counters and mirrors the MANUAL→NONE revert from rdma_counter_free(), ensuring the port state is fully restored on bind failure.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/4517686789b404827591c52f79e9a57822371ca0
• https://git.kernel.org/stable/c/7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a
• https://git.kernel.org/stable/c/1bcdeddddffadff9993657f6b0e5535d66ebd10f
• https://git.kernel.org/stable/c/da95cb016812c0e012ea839f191926e35ca8f57f
• https://git.kernel.org/stable/c/4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd