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authorAurelien Aptel <aaptel@suse.com>2019-03-29 10:49:12 +0100
committerSteve French <stfrench@microsoft.com>2019-04-16 09:38:38 -0500
commitb98749cac4a695f084a5ff076f4510b23e353ecd (patch)
treeb1b5aa35d4d1410bef00756fb2aacb125f5cb729 /tools
parentcifs: fix handle leak in smb2_query_symlink() (diff)
downloadlinux-dev-b98749cac4a695f084a5ff076f4510b23e353ecd.tar.xz
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CIFS: keep FileInfo handle live during oplock break
In the oplock break handler, writing pending changes from pages puts the FileInfo handle. If the refcount reaches zero it closes the handle and waits for any oplock break handler to return, thus causing a deadlock. To prevent this situation: * We add a wait flag to cifsFileInfo_put() to decide whether we should wait for running/pending oplock break handlers * We keep an additionnal reference of the SMB FileInfo handle so that for the rest of the handler putting the handle won't close it. - The ref is bumped everytime we queue the handler via the cifs_queue_oplock_break() helper. - The ref is decremented at the end of the handler This bug was triggered by xfstest 464. Also important fix to address the various reports of oops in smb2_push_mandatory_locks Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> CC: Stable <stable@vger.kernel.org>
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