[PATCH] erofs: fix race in z_erofs_get_gbuf()

[Gao Xiang]

In z_erofs_get_gbuf(), the current task may be migrated to another
CPU between `z_erofs_gbuf_id()` and `spin_lock(&gbuf->lock)`.

Therefore, z_erofs_put_gbuf() will trigger the following issue
which was found by stress test:

<2>[772156.434168] kernel BUG at fs/erofs/zutil.c:58!
..
<4>[772156.435007]
<4>[772156.439237] CPU: 0 PID: 3078 Comm: stress Kdump: loaded Tainted: G       
     E      6.10.0-rc7+ #2
<4>[772156.439239] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 1.0.0 
01/01/2017
<4>[772156.439241] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS 
BTYPE=--)
<4>[772156.439243] pc : z_erofs_put_gbuf+0x64/0x70 [erofs]
<4>[772156.439252] lr : z_erofs_lz4_decompress+0x600/0x6a0 [erofs]
..
<6>[772156.445958] stress (3127): drop_caches: 1
<4>[772156.446120] Call trace:
<4>[772156.446121]  z_erofs_put_gbuf+0x64/0x70 [erofs]
<4>[772156.446761]  z_erofs_lz4_decompress+0x600/0x6a0 [erofs]
<4>[772156.446897]  z_erofs_decompress_queue+0x740/0xa10 [erofs]
<4>[772156.447036]  z_erofs_runqueue+0x428/0x8c0 [erofs]
<4>[772156.447160]  z_erofs_readahead+0x224/0x390 [erofs]
..

Fixes: f36f3010f676 ("erofs: rename per-CPU buffers to global buffer pool and 
make it configurable")
Cc: <sta...@vger.kernel.org> # 6.10+
Cc: Chunhai Guo <guochun...@vivo.com>
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
 fs/erofs/zutil.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c
index b80f612867c2..9b53883e5caf 100644
--- a/fs/erofs/zutil.c
+++ b/fs/erofs/zutil.c
@@ -38,11 +38,13 @@ void *z_erofs_get_gbuf(unsigned int requiredpages)
 {
        struct z_erofs_gbuf *gbuf;
 
+       migrate_disable();
        gbuf = &z_erofs_gbufpool[z_erofs_gbuf_id()];
        spin_lock(&gbuf->lock);
        /* check if the buffer is too small */
        if (requiredpages > gbuf->nrpages) {
                spin_unlock(&gbuf->lock);
+               migrate_enable();
                /* (for sparse checker) pretend gbuf->lock is still taken */
                __acquire(gbuf->lock);
                return NULL;
@@ -57,6 +59,7 @@ void z_erofs_put_gbuf(void *ptr) __releases(gbuf->lock)
        gbuf = &z_erofs_gbufpool[z_erofs_gbuf_id()];
        DBG_BUGON(gbuf->ptr != ptr);
        spin_unlock(&gbuf->lock);
+       migrate_enable();
 }
 
 int z_erofs_gbuf_growsize(unsigned int nrpages)
-- 
2.43.5