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[libjar] Add some extra sanity checks to our Zip reader.

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Moonchild 2022-12-15 11:49:39 +00:00 • committed by roytam1
commit a876dc7420
1 changed files with 15 additions and 2 deletions
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17
modules/libjar/nsZipArchive.cpp
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@ -885,15 +885,22 @@ nsZipHandle* nsZipArchive::GetFD()
uint32_t nsZipArchive::GetDataOffset(nsZipItem* aItem)
{
MOZ_ASSERT(aItem);
uint32_t offset;
MOZ_WIN_MEM_TRY_BEGIN
//-- read local header to get variable length values and calculate
//-- the real data offset
uint32_t len = mFd->mLen;
const uint8_t* data = mFd->mFileData;
uint32_t offset = aItem->LocalOffset();
offset = aItem->LocalOffset();
if (len < ZIPLOCAL_SIZE || offset > len - ZIPLOCAL_SIZE)
return 0;
// Check there's enough space for the signature
if (offset > mFd->mLen) {
NS_WARNING("Corrupt local offset in JAR file");
return 0;
}
// -- check signature before using the structure, in case the zip file is corrupt
ZipLocal* Local = (ZipLocal*)(data + offset);
if ((xtolong(Local->signature) != LOCALSIG))
@ -906,8 +913,14 @@ MOZ_WIN_MEM_TRY_BEGIN
xtoint(Local->filename_len) +
xtoint(Local->extrafield_len);
return offset;
// Check data points inside the file.
if (offset > mFd->mLen) {
NS_WARNING("Corrupt data offset in JAR file");
return 0;
}
MOZ_WIN_MEM_TRY_CATCH(return 0)
// Can't be 0
return offset;
}
//---------------------------------------------