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pMVaxY10vBQtYQH81Enzey7i96P2bIxXloq3IOhv93pH9CGyt+0qb6pcaz4ijgPgxABkpiNTMiB ZHkpNcfON4pjLGUfhxHU4J/iMLX3Q4pwN4M8L7JUdeUgq3u9TsHJxDfDYqG6Hga1jEJhJqDn/y9 h+aV2mz97i4p7Kd78P5CYRSTlmuXJiM1mVnE5NNJ2F1FNuf73kN+HhZiAHo8GEVbEb/eqBDOUDb Cm3QSiZZYlC3sLit+8MWFMGQOH5/XfX6IApcbNFeLtg0ZI3g9jU8SRrGFD51b5ZIuKWDpHgLRht gmwTdo0gtylVMoBTaVFdZTEJs+tkpeIxcjeyRGm/noPulA6MhwJMdHGEFsB31nUlz9qUqnHf > The reproducer uses FAULT_INJECTION to make memory allocation fail, which > causes __filemap_get_folio() to fail, when initializing w_folios[i] in > ocfs2_grab_folios_for_write(), it only returns an error code and the value > of w_folios[i] is the error code, which causes ocfs2_unlock_and_free_folios() > to recycle the invalid w_folios[i] when releasing folios. > > Reported-by: syzbot+c2ea94ae47cd7e3881ec@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=c2ea94ae47cd7e3881ec > Signed-off-by: Lizhi Xu > --- > fs/ocfs2/aops.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c > index 40b6bce12951..89aadc6cdd87 100644 > --- a/fs/ocfs2/aops.c > +++ b/fs/ocfs2/aops.c > @@ -1071,6 +1071,7 @@ static int ocfs2_grab_folios_for_write(struct address_space *mapping, > if (IS_ERR(wc->w_folios[i])) { > ret = PTR_ERR(wc->w_folios[i]); > mlog_errno(ret); > + wc->w_folios[i] = NULL; > goto out; > } > } > -- > 2.43.0 sorry for the cut and paste reply. My email system rejected and bounced the original email. ACKed-by: Mark Tinguely