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loadsave: check for errors when using temp file

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Previously, the return value of fwrite and fclose were not properly
checked, leading to possible silent truncation of the data if writing
failed, e.g. due to lack of disk space.

Fixes issue #9251.
This commit is contained in:
Jeremy Maitin-Shepard 2017-07-27 13:44:36 -07:00
parent 06407b4d14
commit 2be955a0ef
1 changed files with 9 additions and 2 deletions
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11
modules/imgcodecs/src/loadsave.cpp
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@ -651,8 +651,15 @@ imdecode_( const Mat& buf, int flags, int hdrtype, Mat* mat=0 )
if( !f )
return 0;
size_t bufSize = buf.cols*buf.rows*buf.elemSize();
fwrite( buf.ptr(), 1, bufSize, f );
fclose(f);
if( fwrite( buf.ptr(), 1, bufSize, f ) != bufSize )
{
fclose( f );
CV_Error( CV_StsError, "failed to write image data to temporary file" );
}
if( fclose(f) != 0 )
{
CV_Error( CV_StsError, "failed to write image data to temporary file" );
}
decoder->setSource(filename);
}