Description
In the Linux kernel, the following vulnerability has been resolved: ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning The hand-rolled bit-scanning loop in the NCQ completion path has an infinite loop bug. When tag_mask has only high bits set (e.g. 0x80000000), the inner while loop left-shifts tag_mask until it overflows to 0. At that point !(0 & 1) is always true and 0 <<= 1 stays 0, causing an infinite loop in hardirq context with a spinlock held. Replace the open-coded bit-scanning with __ffs() which correctly finds the least significant set bit and is bounded by the width of the argument.
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
62936009f35a6659cc3ebe0d90c754182d60da73 to < ea9fa4dabe476f85fe73df30a6ab61a23c22fda4affected62936009f35a6659cc3ebe0d90c754182d60da73 to < d72e8089dc332ac48293512ef0de77cbe0e04d25affected62936009f35a6659cc3ebe0d90c754182d60da73 to < 4c6e64cae2b2dab32ad9099faa339f6a72c0ce16affected62936009f35a6659cc3ebe0d90c754182d60da73 to < 8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80affected62936009f35a6659cc3ebe0d90c754182d60da73 to < 1842d45f461a78988254631893329bdf4596e954affected62936009f35a6659cc3ebe0d90c754182d60da73 to < 29b916d3556bd12a95be7c56ca391b8cd572f8beaffected62936009f35a6659cc3ebe0d90c754182d60da73 to < c2130f6553f4a5cbdc259de069600117a995f197affected
Linux Linux
Default version status: affected
2.6.36affected0 to < 2.6.36unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.6.148 to ≤ 6.6.*unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ea9fa4dabe476f85fe73df30a6ab61a23c22fda4 ↗
- https://git.kernel.org/stable/c/d72e8089dc332ac48293512ef0de77cbe0e04d25 ↗
- https://git.kernel.org/stable/c/4c6e64cae2b2dab32ad9099faa339f6a72c0ce16 ↗
- https://git.kernel.org/stable/c/8c5de0d8ab6824cfdadcbbe1be4c6c9d9f4c1f80 ↗
- https://git.kernel.org/stable/c/1842d45f461a78988254631893329bdf4596e954 ↗
- https://git.kernel.org/stable/c/29b916d3556bd12a95be7c56ca391b8cd572f8be ↗
- https://git.kernel.org/stable/c/c2130f6553f4a5cbdc259de069600117a995f197 ↗