net: ppp: Don't call bpf_prog_create() in ppp_lock
In ppp_ioctl(), bpf_prog_create() is called inside ppp_lock, which eventually calls vmalloc() and hits BUG_ON() in vmalloc.c. This patch works around the problem by moving the allocation outside the lock. The bug was revealed by the recent change in net/core/filter.c, as it allocates via vmalloc() instead of kmalloc() now. Reported-and-tested-by: Stefan Seyfried <stefan.seyfried@googlemail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -755,23 +755,23 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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err = get_filter(argp, &code);
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if (err >= 0) {
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struct bpf_prog *pass_filter = NULL;
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struct sock_fprog_kern fprog = {
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.len = err,
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.filter = code,
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};
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ppp_lock(ppp);
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if (ppp->pass_filter) {
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bpf_prog_destroy(ppp->pass_filter);
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ppp->pass_filter = NULL;
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err = 0;
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if (fprog.filter)
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err = bpf_prog_create(&pass_filter, &fprog);
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if (!err) {
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ppp_lock(ppp);
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if (ppp->pass_filter)
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bpf_prog_destroy(ppp->pass_filter);
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ppp->pass_filter = pass_filter;
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ppp_unlock(ppp);
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}
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if (fprog.filter != NULL)
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err = bpf_prog_create(&ppp->pass_filter,
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&fprog);
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else
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err = 0;
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kfree(code);
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ppp_unlock(ppp);
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}
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break;
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}
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@ -781,23 +781,23 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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err = get_filter(argp, &code);
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if (err >= 0) {
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struct bpf_prog *active_filter = NULL;
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struct sock_fprog_kern fprog = {
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.len = err,
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.filter = code,
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};
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ppp_lock(ppp);
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if (ppp->active_filter) {
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bpf_prog_destroy(ppp->active_filter);
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ppp->active_filter = NULL;
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err = 0;
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if (fprog.filter)
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err = bpf_prog_create(&active_filter, &fprog);
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if (!err) {
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ppp_lock(ppp);
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if (ppp->active_filter)
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bpf_prog_destroy(ppp->active_filter);
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ppp->active_filter = active_filter;
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ppp_unlock(ppp);
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}
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if (fprog.filter != NULL)
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err = bpf_prog_create(&ppp->active_filter,
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&fprog);
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else
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err = 0;
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kfree(code);
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ppp_unlock(ppp);
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}
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break;
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}
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