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-rw-r--r--Modules/_fileio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/_fileio.c b/Modules/_fileio.c
index 6093b40..c6b97fb 100644
--- a/Modules/_fileio.c
+++ b/Modules/_fileio.c
@@ -506,7 +506,7 @@ new_buffersize(PyFileIOObject *self, size_t currentsize)
actually be streaming pseudo-files. In this case, we
apply the more aggressive algorithm below.
*/
- if (end >= SMALLCHUNK && pos >= 0) {
+ if (end >= SMALLCHUNK && end >= pos && pos >= 0) {
/* Add 1 so if the file were to grow we'd notice. */
return currentsize + end - pos + 1;
}