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Do not close provided file handles with libtiff

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This commit is contained in:
Andrew Murray 2024-10-11 19:37:56 +11:00
parent 3d9c05c224
commit 7edf952832
2 changed files with 23 additions and 10 deletions
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7
src/PIL/TiffImagePlugin.py
View File

@ -1864,7 +1864,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
if hasattr(fp, "fileno"):
try:
fp.seek(0)
_fp = os.dup(fp.fileno())
_fp = fp.fileno()
except io.UnsupportedOperation:
pass
@ -1943,11 +1943,6 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
fp.write(data)
if errcode:
break
if _fp:
try:
os.close(_fp)
except OSError:
pass
if errcode < 0:
msg = f"encoder error {errcode} when writing image file"
raise OSError(msg)

20
src/libImaging/TiffDecode.c
View File

@ -780,7 +780,7 @@ ImagingLibTiffDecode(
decode_err:
// TIFFClose in libtiff calls tif_closeproc and TIFFCleanup
if (clientstate->fp) {
// Pillow will manage the closing of the file rather than libtiff
// Python will manage the closing of the file rather than libtiff
// So only call TIFFCleanup
TIFFCleanup(tiff);
} else {
@ -1008,7 +1008,17 @@ ImagingLibTiffEncode(Imaging im, ImagingCodecState state, UINT8 *buffer, int byt
) == -1) {
TRACE(("Encode Error, row %d\n", state->y));
state->errcode = IMAGING_CODEC_BROKEN;
// TIFFClose in libtiff calls tif_closeproc and TIFFCleanup
if (clientstate->fp) {
// Python will manage the closing of the file rather than libtiff
// So only call TIFFCleanup
TIFFCleanup(tiff);
} else {
// When tif_closeproc refers to our custom _tiffCloseProc though,
// that is fine, as it does not close the file
TIFFClose(tiff);
}
if (!clientstate->fp) {
free(clientstate->data);
}
@ -1025,14 +1035,22 @@ ImagingLibTiffEncode(Imaging im, ImagingCodecState state, UINT8 *buffer, int byt
TRACE(("Error flushing the tiff"));
// likely reason is memory.
state->errcode = IMAGING_CODEC_MEMORY;
if (clientstate->fp) {
TIFFCleanup(tiff);
} else {
TIFFClose(tiff);
}
if (!clientstate->fp) {
free(clientstate->data);
}
return -1;
}
TRACE(("Closing \n"));
if (clientstate->fp) {
TIFFCleanup(tiff);
} else {
TIFFClose(tiff);
}
// reset the clientstate metadata to use it to read out the buffer.
clientstate->loc = 0;
clientstate->size = clientstate->eof; // redundant?