Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mtd: mtdswap: Avoid freeing registered blktrans device twice In mtdswap_add_mtd(), debugfs setup failure after successful blktrans registration can free mbd_dev twice. add_mtd_blktrans_dev() initializes the blktrans device reference and publishes the disk. Once that succeeds, del_mtd_blktrans_dev() tears the disk down and drops the blktrans reference; when that reference reaches zero, blktrans_dev_release() frees the mtd_blktrans_dev. The debugfs failure path called del_mtd_blktrans_dev(mbd_dev), then fell through the common cleanup label and called kfree(mbd_dev) again. Clear the local pointer after deregistration so the common cleanup can still release the mtdswap state without freeing the blktrans object twice. This issue was found by a static analysis checker and confirmed by manual source review.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before ecadb9137aeaa0615183f8d23eabea2b45c862f1; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before eec130fc9ffbbd08a5d5432683122b79aca2a726; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before d5086911d532b82ca070d944aa08ddde00baefe4; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 0ce48c6ddea1a8e675a2eb0221b62a9950788f3c; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before a82d93fcfdfd26af17049c34319dfdd079cd1901; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 5c349c533e72af2313c3be0f80a24d7407fa4777; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 37be7bc2c2d09c18e939da20224405864a0090b9; affected e8e3edb95ce6a146bc774b6cfad3553f4383edc8 before 779aa4c66a96bf43d2d62982ea1a9096a9128d87 |
| Linux / Linux | affected 4.14; unaffected 0 before 4.14; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ecadb9137aeaa0615183f8d23eabea2b45c862f1
- https://git.kernel.org/stable/c/eec130fc9ffbbd08a5d5432683122b79aca2a726
- https://git.kernel.org/stable/c/d5086911d532b82ca070d944aa08ddde00baefe4
- https://git.kernel.org/stable/c/0ce48c6ddea1a8e675a2eb0221b62a9950788f3c
- https://git.kernel.org/stable/c/a82d93fcfdfd26af17049c34319dfdd079cd1901
- https://git.kernel.org/stable/c/5c349c533e72af2313c3be0f80a24d7407fa4777
- https://git.kernel.org/stable/c/37be7bc2c2d09c18e939da20224405864a0090b9
- https://git.kernel.org/stable/c/779aa4c66a96bf43d2d62982ea1a9096a9128d87