[syzbot] memory leak in z_erofs_do_read_page

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ef4d3ea40565 afs: Fix server->active leak in afs_put_server
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1251434b880000
kernel config: https://syzkaller.appspot.com/x/.config?x=979161df0e247659
dashboard link: https://syzkaller.appspot.com/bug?extid=6f8cd9a0155b366d227f
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1102d8d5880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1549a85b880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3221db92d084/disk-ef4d3ea4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/909a41154e5c/vmlinux-ef4d3ea4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/31207496b5e3/bzImage-ef4d3ea4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/53f3c05f9892/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6f8cd9...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811009c7f8 (size 136):
comm "syz-executor227", pid 3659, jiffies 4294973830 (age 12.500s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff821db19b>] kmem_cache_zalloc include/linux/slab.h:679 [inline]
[<ffffffff821db19b>] z_erofs_alloc_pcluster fs/erofs/zdata.c:152 [inline]
[<ffffffff821db19b>] z_erofs_register_pcluster fs/erofs/zdata.c:497 [inline]
[<ffffffff821db19b>] z_erofs_collector_begin fs/erofs/zdata.c:576 [inline]
[<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740 fs/erofs/zdata.c:728
[<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580 fs/erofs/zdata.c:1670
[<ffffffff814bc0d6>] read_pages+0x86/0x3d0 mm/readahead.c:161
[<ffffffff814bc60d>] page_cache_ra_unbounded+0x1ed/0x220 mm/readahead.c:270
[<ffffffff814bcfe9>] do_page_cache_ra mm/readahead.c:300 [inline]
[<ffffffff814bcfe9>] page_cache_ra_order+0x399/0x410 mm/readahead.c:560
[<ffffffff814bd48d>] ondemand_readahead+0x42d/0x640 mm/readahead.c:682
[<ffffffff814bd7d8>] page_cache_sync_ra+0x138/0x140 mm/readahead.c:709
[<ffffffff814ac448>] page_cache_sync_readahead include/linux/pagemap.h:1213 [inline]
[<ffffffff814ac448>] filemap_get_pages+0x158/0xa00 mm/filemap.c:2581
[<ffffffff814ace2e>] filemap_read+0x13e/0x520 mm/filemap.c:2675
[<ffffffff814ad3e9>] generic_file_read_iter+0x1d9/0x280 mm/filemap.c:2821
[<ffffffff815f782f>] __kernel_read+0x13f/0x340 fs/read_write.c:428
[<ffffffff822729ac>] integrity_kernel_read+0x2c/0x40 security/integrity/iint.c:199
[<ffffffff82276d4c>] ima_calc_file_hash_tfm+0x11c/0x1d0 security/integrity/ima/ima_crypto.c:485
[<ffffffff82277131>] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
[<ffffffff82277131>] ima_calc_file_hash+0xf1/0xa70 security/integrity/ima/ima_crypto.c:573
[<ffffffff82278b57>] ima_collect_measurement+0x307/0x380 security/integrity/ima/ima_api.c:292
[<ffffffff82274dbd>] process_measurement+0x7cd/0xdb0 security/integrity/ima/ima_main.c:337

BUG: memory leak
unreferenced object 0xffff88811009ca18 (size 136):
comm "syz-executor227", pid 3663, jiffies 4294974353 (age 7.270s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff821db19b>] kmem_cache_zalloc include/linux/slab.h:679 [inline]
[<ffffffff821db19b>] z_erofs_alloc_pcluster fs/erofs/zdata.c:152 [inline]
[<ffffffff821db19b>] z_erofs_register_pcluster fs/erofs/zdata.c:497 [inline]
[<ffffffff821db19b>] z_erofs_collector_begin fs/erofs/zdata.c:576 [inline]
[<ffffffff821db19b>] z_erofs_do_read_page+0x99b/0x1740 fs/erofs/zdata.c:728
[<ffffffff821dee9e>] z_erofs_readahead+0x24e/0x580 fs/erofs/zdata.c:1670
[<ffffffff814bc0d6>] read_pages+0x86/0x3d0 mm/readahead.c:161
[<ffffffff814bc60d>] page_cache_ra_unbounded+0x1ed/0x220 mm/readahead.c:270
[<ffffffff814bcfe9>] do_page_cache_ra mm/readahead.c:300 [inline]
[<ffffffff814bcfe9>] page_cache_ra_order+0x399/0x410 mm/readahead.c:560
[<ffffffff814bd48d>] ondemand_readahead+0x42d/0x640 mm/readahead.c:682
[<ffffffff814bd7d8>] page_cache_sync_ra+0x138/0x140 mm/readahead.c:709
[<ffffffff814ac448>] page_cache_sync_readahead include/linux/pagemap.h:1213 [inline]
[<ffffffff814ac448>] filemap_get_pages+0x158/0xa00 mm/filemap.c:2581
[<ffffffff814ace2e>] filemap_read+0x13e/0x520 mm/filemap.c:2675
[<ffffffff814ad3e9>] generic_file_read_iter+0x1d9/0x280 mm/filemap.c:2821
[<ffffffff815f782f>] __kernel_read+0x13f/0x340 fs/read_write.c:428
[<ffffffff822729ac>] integrity_kernel_read+0x2c/0x40 security/integrity/iint.c:199
[<ffffffff82276d4c>] ima_calc_file_hash_tfm+0x11c/0x1d0 security/integrity/ima/ima_crypto.c:485
[<ffffffff82277131>] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
[<ffffffff82277131>] ima_calc_file_hash+0xf1/0xa70 security/integrity/ima/ima_crypto.c:573
[<ffffffff82278b57>] ima_collect_measurement+0x307/0x380 security/integrity/ima/ima_api.c:292
[<ffffffff82274dbd>] process_measurement+0x7cd/0xdb0 security/integrity/ima/ima_main.c:337



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