Hi
When compiled with clang sanitizer option
-fsanitize=signed-integer-overflow, I see the
following error sometimes at runtime when
using gvim-7.4.31:
===
mbyte.c:4622:23: runtime error: signed integer overflow: 2147483647 +
1 cannot be represented in type 'int'
===
I've seen the error twice so far, but I do not
know how to reproduce it.
Code in mbytes.c
4574 static void
4575 im_commit_cb(GtkIMContext *context UNUSED,
....
4594 /* Indicate that preediting has finished. */
4595 if (preedit_start_col == MAXCOL)
4596 {
4597 init_preedit_start_col();
4598 commit_with_preedit = FALSE;
4599 }
....
4622 preedit_start_col += clen;
Integer overflow has undefined behavior in C in theory
(only well defined behavior with unsigned). In practice,
it will most likely wrap but I'm not sure that wrapping
makes sense here anyway.
Value 2147483647 of preedit_start is MAXCOL, which is
expected to happen since line mbytes.c:4595 tests it.
What is meant to be done at line 4622 when preedit_start_col
is MAXCOL? Any idea on how to reproduce the overflow
all the time?
Dominique
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