Description
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
8511a2728ab82cab398e39d019f5cf1246021c1c to < a1c41aebb184d9228a440dcb6761224e65b0e49aaffected8511a2728ab82cab398e39d019f5cf1246021c1c to < ee28d99d789b077565cbe0377374d1e826c64d93affected8511a2728ab82cab398e39d019f5cf1246021c1c to < c7837e2c96559663c33f43da403d9cf3cf77cfa7affected8511a2728ab82cab398e39d019f5cf1246021c1c to < 7109d69bec6edce546dc870e66bd2b668a3d5549affected8511a2728ab82cab398e39d019f5cf1246021c1c to < 10b7a59814765d18d43555c9cef4eb3048b7e8a3affected8511a2728ab82cab398e39d019f5cf1246021c1c to < b73c4ad4d387fe5bc988145bd9f1bc0de76afd5caffected8511a2728ab82cab398e39d019f5cf1246021c1c to < 8e2bad543eca5c25cd02cbc63d72557934d45f13affected
Linux Linux
Default version status: affected
2.6.31affected0 to < 2.6.31unaffected5.10.260 to ≤ 5.10.*unaffected5.15.211 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.14.2 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a1c41aebb184d9228a440dcb6761224e65b0e49a ↗
- https://git.kernel.org/stable/c/ee28d99d789b077565cbe0377374d1e826c64d93 ↗
- https://git.kernel.org/stable/c/c7837e2c96559663c33f43da403d9cf3cf77cfa7 ↗
- https://git.kernel.org/stable/c/7109d69bec6edce546dc870e66bd2b668a3d5549 ↗
- https://git.kernel.org/stable/c/10b7a59814765d18d43555c9cef4eb3048b7e8a3 ↗
- https://git.kernel.org/stable/c/b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c ↗
- https://git.kernel.org/stable/c/8e2bad543eca5c25cd02cbc63d72557934d45f13 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗