Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix kernel BUG in ocfs2_find_victim_chain syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the `cl_next_free_rec` field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel. To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true: 1. `cl_next_free_rec` is equal to 0, indicating that there are no free chains in the allocation chain list 2. `cl_next_free_rec` is greater than `cl_count` (the total number of chains in the allocation chain list) Either of them being true is indicative of the fact that there are no chains left for usage. This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.
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
ccd979bdbce9fba8412beb3f1de68a9d0171b12c to < 1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7affectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < d0fd1f732ea8063cecd07a3879b7d815c7ee71edaffectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < b08a33d5f80efe6979a6e8f905c1a898910c21ddaffectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < 96f1b074c98c20f55a3b23d2ab44d9fb0f619869affectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < e24aedae71652d4119049f1fbef6532ccbe3966daffectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < 7acc0390e0dd7474c4451d05465a677d55ad4268affectedccd979bdbce9fba8412beb3f1de68a9d0171b12c to < 039bef30e320827bac8990c9f29d2a68cd8adb5faffected
Linux Linux
Default version status: affected
2.6.16affected0 to < 2.6.16unaffected5.10.248 to ≤ 5.10.*unaffected5.15.198 to ≤ 5.15.*unaffected6.1.160 to ≤ 6.1.*unaffected6.6.120 to ≤ 6.6.*unaffected6.12.64 to ≤ 6.12.*unaffected6.18.3 to ≤ 6.18.*unaffected6.19 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7 ↗
- https://git.kernel.org/stable/c/d0fd1f732ea8063cecd07a3879b7d815c7ee71ed ↗
- https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd ↗
- https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869 ↗
- https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d ↗
- https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268 ↗
- https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f ↗