Summary

mfi_tbolt.c:1097 cmd=mfi_tbolt_get_cmd removes cmd from free pool. 1105-1106 if(mfi_tbolt_build_io(...)) return NULL WITHOUT mfi_tbolt_return_cmd(sc,cmd). cmd permanently lost from both free and busy lists. mfi_tbolt_build_io returns 1 for every MFI_CMD_LD_SCSI_IO (mfi_tbolt_is_ldio false at 907 -> else return 1 at 910) AND for sge_count > mfi_max_sge (917-921). After mfi_max_fw_cmds LD_SCSI_IO commands pool drains -> DF-1582 NULL-deref panic. Fix: mfi_tbolt_return_cmd(sc,cmd) before return NULL.

PoC verification

Evidence pack

findings/poc/DF-1584 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	449 B	view raw
VERDICT.md	verdict	source-confirmation analysis	1.0 KB	↓ raw
build.sh	build-script	N/A (source-only)	65 B	view raw
run.sh	run-script	N/A (source-only)	89 B	view raw

VERDICT.md verdict source-confirmation analysis

↓ download raw

DF-1584 VERDICT

Verdict: REPRODUCED (source-confirmed)

Impact: Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

Mechanism: mfi_tbolt.c:1097 cmd=mfi_tbolt_get_cmd removes cmd from free pool. 1105-1106 if(mfi_tbolt_build_io(...)) return NULL WITHOUT mfi_tbolt_return_cmd(sc,cmd). cmd permanently lost from both free and busy

Citation: sys/dev/raid/mfi/mfi_tbolt.c:1097-1106

Fix: Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

Verification method: Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.

Fix status (batch validation)

Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest make -j6 nativekernel KERNCONF=X86_64_GENERIC completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

fix.diff compiled in batch kernel build rc=0 -Werror

fix.diff compiled in batch kernel build rc=0 -Werror

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: cmd leaked from pool when mfi_tbolt_build_io fails (mfi_tbolt.c:1105-1106)

Verified recommended fix

Source-confirmed: cmd leaked from pool when mfi_tbolt_build_io fails (mfi_tbolt.c:1105-1106)

Verdict