Description
In the Linux kernel, the following vulnerability has been resolved: dlm: fix possible lkb_resource null dereference This patch fixes a possible null pointer dereference when this function is called from request_lock() as lkb->lkb_resource is not assigned yet, only after validate_lock_args() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded. The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled. The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference. In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.
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
43279e5376017c40b4be9af5bc79cbb4ef6f53d7 to < e1ffea6bec96d4349dbfcc42ad3e436259f64243affected43279e5376017c40b4be9af5bc79cbb4ef6f53d7 to < 8d55ce46dd543c6965970ce70c22c3076dd35b1eaffected43279e5376017c40b4be9af5bc79cbb4ef6f53d7 to < 6fbdc3980b70e9c1c86eccea7d5ee68108008fa7affected43279e5376017c40b4be9af5bc79cbb4ef6f53d7 to < 2db11504ef82a60c1a2063ba7431a5cd013ecfcbaffected43279e5376017c40b4be9af5bc79cbb4ef6f53d7 to < b98333c67daf887c724cd692e88e2db9418c0861affected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected5.15.209 to ≤ 5.15.*unaffected6.1.167 to ≤ 6.1.*unaffected6.6.66 to ≤ 6.6.*unaffected6.12.5 to ≤ 6.12.*unaffected6.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e1ffea6bec96d4349dbfcc42ad3e436259f64243 ↗
- https://git.kernel.org/stable/c/8d55ce46dd543c6965970ce70c22c3076dd35b1e ↗
- https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 ↗
- https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb ↗
- https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗