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ximcp: Address warning found by UBSan when growing an empty tree

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imLcPrs.c:681:52: runtime error: applying zero offset to null pointer

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
This commit is contained in:
Jeremy Huddleston Sequoia 2022-12-03 16:26:47 -08:00
parent 7f7bcd7b6f
commit 496d9bfeed
Failed to extract signature
1 changed files with 1 additions and 1 deletions
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modules/im/ximcp/imLcPrs.c
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@ -678,7 +678,7 @@ parseline(
b->treesize = newsize;
/* Re-derive top after realloc() to avoid undefined behaviour
(and crashes on architectures that track pointer bounds). */
if (top >= (DTIndex *) old && top < (DTIndex *) &old[oldsize])
if (old && top >= (DTIndex *) old && top < (DTIndex *) &old[oldsize])
top = (DTIndex *) (((char *)new) + (((char *)top)-(char *)old));
}
p = &b->tree[b->treeused];