fuse: re-lock request before returning from fuse_ref_folio()

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commit b5befa80fd upstream.

fuse_ref_folio() unlocks the request but does not re-lock it before
returning. fuse_chan_abort() can end the request and the async end
callback (eg fuse_writepage_free()) can free the args while the
subsequent copy chain logic after fuse_ref_folio() accesses them,
leading to use-after-free issues.

Fix this by locking the request in fuse_ref_folio() before returning.

Fixes: c3021629a0 ("fuse: support splice() reading from fuse device")
Cc: stable@vger.kernel.org
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Joanne Koong 2026-05-18 22:28:07 -07:00 • committed by Greg Kroah-Hartman

parent 633e1af8a6

commit 5630da218a

1 changed files with 1 additions and 1 deletions

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fs/fuse/dev.c

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