Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [konishi.ryusuke@gmail.com: NOTE added to the commit log]
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
a3d93f709e893187d301aa5458b2248db9f22bd1 to < fb1084e63ee56958b0a56e17a50a4fd86445b9c1affecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < bb61224f6abc8e71bfdf06d7c984e23460875f5baffecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 193b5a1c6c67c36b430989dc063fe7ea4e200a33affecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 7130a87ca32396eb9bf48b71a2d42259ae44c6c7affecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 3936e8714907cd55e37c7cc50e50229e4a9042e8affecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 980663f1d189eedafd18d80053d9cf3e2ceb5c8caffecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 28df4646ad8b433340772edc90ca709cdefc53e2affecteda3d93f709e893187d301aa5458b2248db9f22bd1 to < 7ee29facd8a9c5a26079148e36bcf07141b3a6bcaffected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected4.14.327 to ≤ 4.14.*unaffected4.19.296 to ≤ 4.19.*unaffected5.4.258 to ≤ 5.4.*unaffected5.10.198 to ≤ 5.10.*unaffected5.15.134 to ≤ 5.15.*unaffected6.1.56 to ≤ 6.1.*unaffected6.5.6 to ≤ 6.5.*unaffected6.6 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1 ↗
- https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5b ↗
- https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33 ↗
- https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7 ↗
- https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8 ↗
- https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8c ↗
- https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2 ↗
- https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bc ↗