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Fix sloppy sanity check for mobility going negative in transport

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Assignment to sct_mobil was vulnerable to integer underflow.  Should
not happen, as move_ground() never returns a cost exceeding available
mobility.
This commit is contained in:
Markus Armbruster 2009-12-31 11:27:48 +01:00
parent 2fa5f65257
commit da48ba6d13
1 changed files with 6 additions and 4 deletions
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10
src/lib/commands/tran.c
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@ -134,8 +134,9 @@ tran_nuke(void)
else
pr("No mobility used\n");
getsect(srcx, srcy, &sect);
sect.sct_mobil -= mcost;
if (sect.sct_mobil < 0)
if (sect.sct_mobil >= mcost)
sect.sct_mobil -= mcost;
else
sect.sct_mobil = 0;
putsect(&sect);
return RET_OK;
@ -229,8 +230,9 @@ tran_plane(void)
else
pr("No mobility used\n");
getsect(srcx, srcy, &sect);
sect.sct_mobil -= mcost;
if (sect.sct_mobil < 0)
if (sect.sct_mobil >= mcost)
sect.sct_mobil -= mcost;
else
sect.sct_mobil = 0;
putsect(&sect);
return RET_OK;