In the Linux kernel, the following vulnerability has been resolved: net/smc: Avoid overwriting the copies of clcsock callback functions The callback functions of clcsock will be saved and replaced during the fallback. But if the fallback happens more than once, then the copies of these callback functions will be overwritten incorrectly, resulting in a loop call issue: clcsk->sk_error_report |- smc_fback_error_report() <------------------------------| |- smc_fback_forward_wakeup() | (loop) |- clcsock_callback() (incorrectly overwritten) | |- smc->clcsk_error_report() ------------------| So this patch fixes the issue by saving these function pointers only once in the fallback and avoiding overwriting.
Upstream commit 1de9770d121ee9294794cca0e0be8fbfa0134ee8 was introduced into RHEL as d00cae867efb20542ed955ebe4a29ab6bb9f539b via BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2044294 This code is present in RHEL9.1.