Re: [PATCH] xfs: handle NULL b_addr in xfs_buf_free
Carlos Maiolino <[email protected]>
| Newsgroups | org.kernel.vger.linux-xfs,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <178463069397.324722.16521599214171804128.b4-ty@b4> |
On Sun, 19 Jul 2026 23:11:24 +0800, Yun Zhou wrote:
> When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with
> bp->b_addr still NULL. The code falls through to the folio_put path
> which calls virt_to_folio(NULL), dereferencing an invalid address and
> causing a kernel crash.
>
> Call Trace:
> xfs_buf_free+0x25f/0x510
> xfs_buf_alloc+0xc98/0x19b0
> xfs_buf_find_insert+0x55/0x14d0
> xfs_buf_get_map+0x122b/0x17c0
> xfbtree_init_leaf_block+0x11c/0x4a0
> xfbtree_init+0x1bb/0x460
> xrep_rmap_setup_scan+0x100/0x1f0
> xrep_rmapbt+0x41/0xc0
>
> [...]
Applied to for-next, thanks!
[1/1] xfs: handle NULL b_addr in xfs_buf_free
commit: 2ba9288085f15d2eec21cdafe438a9d03f44737a
Best regards,
--
Carlos Maiolino <[email protected]>