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Fix out-of-bounds read in StreamReader::IncPtr (#6600)

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Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>
This commit is contained in:
uwezkhan
2026-04-29 16:54:29 +05:30
committed by GitHub
parent 9e56e52252
commit 11a5d1b8ef
1 changed files with 16 additions and 3 deletions
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19
include/assimp/StreamReader.h
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@@ -196,10 +196,23 @@ public:
// ---------------------------------------------------------------------
/** Increase the file pointer (relative seeking) */
void IncPtr(intptr_t plus) {
mCurrent += plus;
if (mCurrent > mLimit) {
throw DeadlyImportError("End of file or read limit was reached");
// Ensure internal pointer invariants hold
if (mCurrent < mBuffer || mCurrent > mLimit) {
throw DeadlyImportError("StreamReader: Invalid internal pointer state");
}
if (plus < 0) {
const size_t absPlus = static_cast<size_t>(-(plus + 1)) + 1;
if (absPlus > static_cast<size_t>(mCurrent - mBuffer)) {
throw DeadlyImportError("StreamReader: Attempted to seek outside buffer bounds");
}
} else if (plus > 0) {
if (static_cast<size_t>(plus) > static_cast<size_t>(mLimit - mCurrent)) {
throw DeadlyImportError("StreamReader: Attempted to seek outside buffer bounds");
}
}
mCurrent += plus;
}
// ---------------------------------------------------------------------