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Improve robustness of TessdataManager

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Tesseract crashes with an unhandled exception (std::bad_alloc) if it gets
a bad tessdata file where the numEntries data field is very large (also
after swapping), for example 0x77777777.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2017-05-14 21:32:26 +02:00
parent ffb1ec3535
commit 079d6b9161
1 changed files with 1 additions and 0 deletions
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ccutil/tessdatamanager.cpp
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@ -54,6 +54,7 @@ bool TessdataManager::LoadMemBuffer(const char *name, const char *data,
swap_ = num_entries > kMaxNumTessdataEntries || num_entries < 0; swap_ = num_entries > kMaxNumTessdataEntries || num_entries < 0;
fp.set_swap(swap_); fp.set_swap(swap_);
if (swap_) ReverseN(&num_entries, sizeof(num_entries)); if (swap_) ReverseN(&num_entries, sizeof(num_entries));
if (num_entries > kMaxNumTessdataEntries || num_entries < 0) return false;
GenericVector<inT64> offset_table; GenericVector<inT64> offset_table;
offset_table.resize_no_init(num_entries); offset_table.resize_no_init(num_entries);
if (fp.FReadEndian(&offset_table[0], sizeof(offset_table[0]), num_entries) != if (fp.FReadEndian(&offset_table[0], sizeof(offset_table[0]), num_entries) !=