jfs: Fix uninit-value access of new_ea in ea_buffer

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: jfs: Fix uninit-value access of new_ea in ea_buffer syzbot reports that lzo1x_1_do_compress is using uninit-value: ===================================================== BUG: KMSAN: uninit-value in lzo1x_1_do_compress+0x19f9/0x2510 lib/lzo/lzo1x_compress.c:178 ... Uninit was stored to memory at: ea_put fs/jfs/xattr.c:639 [inline] ... Local variable ea_buf created at: __jfs_setxattr+0x5d/0x1ae0 fs/jfs/xattr.c:662 __jfs_xattr_set+0xe6/0x1f0 fs/jfs/xattr.c:934 ===================================================== The reason is ea_buf->new_ea is not initialized properly. Fix this by using memset to empty its content at the beginning in ea_get().

References

• https://git.kernel.org/stable/c/7b24d41d47a6805c45378debf8bd115675d41da8
• https://git.kernel.org/stable/c/dac398ed272a378d2f42ac68ae408333a51baf52
• https://git.kernel.org/stable/c/8b1dcf25c26d42e4a68c4725ce52a0543c7878cc
• https://git.kernel.org/stable/c/d7444f91a9f93eaa48827087ed0f3381c194181d
• https://git.kernel.org/stable/c/6041536d18c5f51a84bc37cd568cbab61870031e
• https://git.kernel.org/stable/c/c076b3746224982eebdba5c9e4b1467e146c0d64
• https://git.kernel.org/stable/c/7c244d5b48284a770d96ff703df2dfeadf804a73
• https://git.kernel.org/stable/c/8ad8b531de79c348bcb8133e7f5e827b884226af
• https://git.kernel.org/stable/c/2b59ffad47db1c46af25ccad157bb3b25147c35c