[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 4/7] xen/ubsan: expand pointer overflow message printing
Add messages about operations against the NULL pointer, or that result in a NULL pointer. Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> --- xen/common/ubsan/ubsan.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/xen/common/ubsan/ubsan.c b/xen/common/ubsan/ubsan.c index 7ebe4bfc14dc..20aa0cb598e1 100644 --- a/xen/common/ubsan/ubsan.c +++ b/xen/common/ubsan/ubsan.c @@ -517,9 +517,18 @@ void __ubsan_handle_pointer_overflow(struct pointer_overflow_data *data, ubsan_prologue(&data->location, &flags); - pr_err("pointer operation %s %p to %p\n", - base > result ? "overflowed" : "underflowed", - _p(base), _p(result)); + if (!base && !result) + pr_err("applying zero offset to null pointer\n"); + else if (!base && result) + pr_err("applying non-zero offset %p to null pointer\n", + _p(result)); + else if (base && !result) + pr_err("applying non-zero offset to non-null pointer %p produced null pointer\n", + _p(base)); + else + pr_err("pointer operation %s %p to %p\n", + base > result ? "overflowed" : "underflowed", + _p(base), _p(result)); ubsan_epilogue(&flags); } -- 2.48.1
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