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authordgp <dgp@users.sourceforge.net>2015-09-23 16:00:57 (GMT)
committerdgp <dgp@users.sourceforge.net>2015-09-23 16:00:57 (GMT)
commit4fb1c76abea23369b4d961e2b20f900dd0294e82 (patch)
tree894a3a003d265bf40aa247339ed94b0d0c7a8050 /generic/tclIO.c
parent55cb367ecb24a49e0fe76b104f6fe709672b066b (diff)
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Protect CopyState buffer from conflicting uses when CopyData() is called
recursively. Also, have ReflectWatch() always give driver a chance to act.
Diffstat (limited to 'generic/tclIO.c')
-rw-r--r--generic/tclIO.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/generic/tclIO.c b/generic/tclIO.c
index 27eee5a..09b2537 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -114,6 +114,7 @@ typedef struct CopyState {
Tcl_Interp *interp; /* Interp that started the copy. */
Tcl_Obj *cmdPtr; /* Command to be invoked at completion. */
int refCount; /* Claim count on the struct */
+ int bufInUse; /* Flag to govern access to buffer */
int bufSize; /* Size of appended buffer. */
char buffer[1]; /* Copy buffer, this must be the last
* field. */
@@ -8661,6 +8662,7 @@ TclCopyChannel(
}
csPtr->cmdPtr = cmdPtr;
csPtr->refCount = 1;
+ csPtr->bufInUse = 0;
inStatePtr->csPtrR = csPtr;
PreserveCopyState(csPtr);
@@ -8717,6 +8719,9 @@ CopyData(
/* Encoding control */
int underflow; /* Input underflow */
+ if (csPtr->bufInUse) {
+ return TCL_OK;
+ }
PreserveCopyState(csPtr);
inChan = (Tcl_Channel) csPtr->readPtr;
@@ -8780,6 +8785,7 @@ CopyData(
sizeb = csPtr->toRead;
}
+ csPtr->bufInUse = 1;
if (inBinary || sameEncoding) {
size = DoRead(inStatePtr->topChanPtr, csPtr->buffer, sizeb);
} else {
@@ -8851,6 +8857,7 @@ CopyData(
} else {
sizeb = WriteChars(outStatePtr->topChanPtr, buffer, sizeb);
}
+ csPtr->bufInUse = 0;
/*
* [Bug 2895565]. At this point 'size' still contains the number of