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atoi() has undefined behavior on out-of-range values. Parse the numeric suffix of form field names with strtol(), validate errno and the range, and return -1 on any invalid input instead. Fixes OpenPrinting#1748
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Summary
atoi()is used to parse the numeric suffix of CGI form field names into anarray index in
cgi-bin/var.c. On values that exceedINT_MAXthis isundefined behavior, and the result cannot be reliably validated by the
subsequent range check in
cgiSetArray().Add a
_cups_parse_index()helper that usesstrtol(), resets and checkserrnoforERANGE, and validates the parsed value before converting it toan index. Use it at the three sites that build array indices.
Changes
cgi-bin/var.c_cups_parse_index(); replace 3atoi(x)-1index computationsTest Plan
make(object compiles cleanly).non-numeric / negative / empty all return expected indices or -1.
Fixes #1748