Description
In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before a10cede006f9614b465cf25609a8753efbfd45cc
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 0998a6cb232674408a03e8561dc15aa266b2f53b
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before db5c9a162d2f42bcc842b76b3d935dcc050a0eec
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before c12003bf91fdff381c55ef54fef3e961a5af2545
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 9ba1a7802ca9a2590cef95b253e6526f4364477f
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 901f44227072be60812fe8083e83e1533c04eed1
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before efaf89a75a29b2d179bf4fe63ca62852e93ad620
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 18c4ef4e765a798b47980555ed665d78b71aeadf
5.4.302 (semver)
5.10.247 (semver)
5.15.197 (semver)
6.1.159 (semver)
6.6.117 (semver)
6.12.58 (semver)
6.17.8 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/a10cede006f9614b465cf25609a8753efbfd45cc
git.kernel.org/...c/0998a6cb232674408a03e8561dc15aa266b2f53b
git.kernel.org/...c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
git.kernel.org/...c/c12003bf91fdff381c55ef54fef3e961a5af2545
git.kernel.org/...c/9ba1a7802ca9a2590cef95b253e6526f4364477f
git.kernel.org/...c/901f44227072be60812fe8083e83e1533c04eed1
git.kernel.org/...c/efaf89a75a29b2d179bf4fe63ca62852e93ad620
git.kernel.org/...c/18c4ef4e765a798b47980555ed665d78b71aeadf
