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Subjectmemory leak in nfs_fs_context_parse_monolithic

syzbot found the following crash on:

HEAD commit: 0bf999f9 linux/pipe_fs_i.h: fix kernel-doc warnings after ..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:
C reproducer:

IMPORTANT: if you fix the bug, please add the following tag to the commit:

executing program
BUG: memory leak
unreferenced object 0xffff8881166b3ac0 (size 32):
comm "syz-executor191", pid 7127, jiffies 4294946216 (age 12.850s)
hex dump (first 32 bytes):
00 66 73 00 00 00 00 00 00 00 00 00 00 00 00 00 .fs.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[<000000006202a794>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
[<000000006202a794>] slab_post_alloc_hook mm/slab.h:586 [inline]
[<000000006202a794>] slab_alloc mm/slab.c:3320 [inline]
[<000000006202a794>] __do_kmalloc mm/slab.c:3654 [inline]
[<000000006202a794>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671
[<000000007e324303>] kstrdup+0x3a/0x70 mm/util.c:60
[<000000002835aac3>] nfs23_parse_monolithic fs/nfs/fs_context.c:958 [inline]
[<000000002835aac3>] nfs_fs_context_parse_monolithic+0x5cf/0x8f0 fs/nfs/fs_context.c:1147
[<000000004fe3f934>] parse_monolithic_mount_data+0x37/0x40 fs/fs_context.c:679
[<00000000dccb779f>] do_new_mount fs/namespace.c:2818 [inline]
[<00000000dccb779f>] do_mount+0x945/0xc80 fs/namespace.c:3107
[<000000006234487e>] __do_sys_mount fs/namespace.c:3316 [inline]
[<000000006234487e>] __se_sys_mount fs/namespace.c:3293 [inline]
[<000000006234487e>] __x64_sys_mount+0xc0/0x140 fs/namespace.c:3293
[<00000000d2937fdd>] do_syscall_64+0x73/0x220 arch/x86/entry/common.c:294
[<00000000fa6ba8f3>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

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