f2fs: avoid format-overflow warning

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: avoid format-overflow warning With gcc and W=1 option, there's a warning like this: fs/f2fs/compress.c: In function ‘f2fs_init_page_array_cache’: fs/f2fs/compress.c:1984:47: error: ‘%u’ directive writing between 1 and 7 bytes into a region of size between 5 and 8 [-Werror=format-overflow=] 1984 | sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev)); | ^~ String "f2fs_page_array_entry-%u:%u" can up to 35. The first "%u" can up to 4 and the second "%u" can up to 7, so total size is "24 + 4 + 7 = 35". slab_name's size should be 35 rather than 32.

References

• https://git.kernel.org/stable/c/c041f5ddef00c731c541e00bc8ae97b8c84c682f
• https://git.kernel.org/stable/c/e4088d7d8f1123006d46a42edf51b8c960a58ef9
• https://git.kernel.org/stable/c/526dd7540a09ecf87b5f54f3ab4e0a2528f25a79
• https://git.kernel.org/stable/c/6fca08fd3085253b48fcb1bd243a0a5e18821a00
• https://git.kernel.org/stable/c/3eebe636cac53886bd5d1cdd55e082ec9e84983f
• https://git.kernel.org/stable/c/e0d4e8acb3789c5a8651061fbab62ca24a45c063