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CVE-2024-35852

mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work The rehash delayed work is rescheduled with a delay if the number of credits at end of the work is not negative as supposedly it means that the migration ended. Otherwise, it is rescheduled immediately. After "mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash" the above is no longer accurate as a non-negative number of credits is no longer indicative of the migration being done. It can also happen if the work encountered an error in which case the migration will resume the next time the work is scheduled. The significance of the above is that it is possible for the work to be pending and associated with hints that were allocated when the migration started. This leads to the hints being leaked [1] when the work is canceled while pending as part of ACL region dismantle. Fix by freeing the hints if hints are associated with a work that was canceled while pending. Blame the original commit since the reliance on not having a pending work associated with hints is fragile. [1] unreferenced object 0xffff88810e7c3000 (size 256): comm "kworker/0:16", pid 176, jiffies 4295460353 hex dump (first 32 bytes): 00 30 95 11 81 88 ff ff 61 00 00 00 00 00 00 80 .0......a....... 00 00 61 00 40 00 00 00 00 00 00 00 04 00 00 00 ..a.@........... backtrace (crc 2544ddb9): [<00000000cf8cfab3>] kmalloc_trace+0x23f/0x2a0 [<000000004d9a1ad9>] objagg_hints_get+0x42/0x390 [<000000000b143cf3>] mlxsw_sp_acl_erp_rehash_hints_get+0xca/0x400 [<0000000059bdb60a>] mlxsw_sp_acl_tcam_vregion_rehash_work+0x868/0x1160 [<00000000e81fd734>] process_one_work+0x59c/0xf20 [<00000000ceee9e81>] worker_thread+0x799/0x12c0 [<00000000bda6fe39>] kthread+0x246/0x300 [<0000000070056d23>] ret_from_fork+0x34/0x70 [<00000000dea2b93e>] ret_from_fork_asm+0x1a/0x30

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected c9c9af91f1d9a636aecc55302c792538e549a430 before 51cefc9da400b953fee749c9e5d26cd4a2b5d758; affected c9c9af91f1d9a636aecc55302c792538e549a430 before 857ed800133ffcfcee28582090b63b0cbb8ba59d; affected c9c9af91f1d9a636aecc55302c792538e549a430 before 63d814d93c5cce4c18284adc810028f28dca493f; affected c9c9af91f1d9a636aecc55302c792538e549a430 before 5bfe7bf9656ed2633718388f12b7c38b86414a04; affected c9c9af91f1d9a636aecc55302c792538e549a430 before de1aaefa75be9d0ec19c9a3e0e2f9696de20c6ab; affected c9c9af91f1d9a636aecc55302c792538e549a430 before d72dd6fcd7886d0523afbab8b4a4b22d17addd7d; affected c9c9af91f1d9a636aecc55302c792538e549a430 before fb4e2b70a7194b209fc7320bbf33b375f7114bd5
Linux / Linuxaffected 5.1; unaffected 0 before 5.1; unaffected 5.4.275 through 5.4.*; unaffected 5.10.216 through 5.10.*; unaffected 5.15.158 through 5.15.*; unaffected 6.1.90 through 6.1.*; unaffected 6.6.30 through 6.6.*; unaffected 6.8.9 through 6.8.*; unaffected 6.9 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.