github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-28 10:09:10 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

pNFS: Fix use-after-free in pnfs_update_layout()

Browse Source 
When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),
the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,
pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),
which still references 'lo'. This results in a use-after-free when the
tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

Fixes: 2c8d5fc37f ("pNFS: Stricter ordering of layoutget and layoutreturn")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Signed-off-by: Anna Schumaker <anna.schumaker@hammerspace.com>
This commit is contained in:
Wentao Liang 2026-05-18 13:10:36 +00:00 committed by Anna Schumaker
parent 35168eb947
commit 13e198a90c
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/pnfs.c
View File

@ -2229,11 +2229,11 @@ pnfs_update_layout(struct inode *ino,
dprintk("%s wait for layoutreturn\n", __func__);
lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
if (!IS_ERR(lseg)) {
pnfs_put_layout_hdr(lo);
dprintk("%s retrying\n", __func__);
trace_pnfs_update_layout(ino, pos, count, iomode, lo,
lseg,
PNFS_UPDATE_LAYOUT_RETRY);
pnfs_put_layout_hdr(lo);
goto lookup_again;
}
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,