CVE-2026-64361hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length

Official description

In the Linux kernel, the following vulnerability has been resolved: hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length check_and_correct_requested_length() compares (off + len) against node_size using u32 arithmetic. When the caller passes a large len value (e.g. from an underflowed subtraction in hfs_brec_remove()), off + len can wrap past 2^32 and produce a small result, causing the bounds check to pass when it should fail. For example, with off=14 and len=0xFFFFFFF2 (underflowed from data_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6, which is less than a typical node_size of 512, so the check passes and the subsequent memmove reads ~4GB past the node buffer. Fix this by widening the addition to u64 before comparing against node_size. This prevents the u32 wrap while keeping the logic straightforward.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d
• https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1
• https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9
• https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7
• https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b
• https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad
• https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f
• https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7