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common/gossmap: don't memcpy NULL, 0, and don't add 0 to NULL pointer.

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Of course, NULL and length 0 are natural partners, but We Can't Have Nice Things.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2023-04-01 14:10:23 +10:30
parent 3be36a66e3
commit 2005ca436e
2 changed files with 7 additions and 3 deletions
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6
wire/fromwire.c
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@@ -32,9 +32,11 @@ const u8 *fromwire(const u8 **cursor, size_t *max, void *copy, size_t n)
SUPERVERBOSE("less than encoding length");
return fromwire_fail(cursor, max);
}
*cursor += n;
/* ubsan: runtime error: applying zero offset to null pointer */
if (*cursor)
*cursor += n;
*max -= n;
if (copy)
if (copy && n)
memcpy(copy, p, n);
return memcheck(p, n);
}