mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-10-09 16:34:44 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 17

bpo-46841: Don't scan backwards in bytecode (GH-31901)

Browse source
This commit is contained in:
Mark Shannon 2022-03-16 00:08:37 +00:00 • committed by GitHub
parent a4674f0194
commit 49e1e1e1bd
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 12 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

7
Objects/genobject.c
View file

@ -359,9 +359,12 @@ _PyGen_yf(PyGenObject *gen)
assert(code[0] != SEND);
return NULL;
}
if (code[(frame->f_lasti-1)*sizeof(_Py_CODEUNIT)] != SEND || frame->stacktop < 0)
int opcode = code[(frame->f_lasti+1)*sizeof(_Py_CODEUNIT)];
int oparg = code[(frame->f_lasti+1)*sizeof(_Py_CODEUNIT)+1];
if (opcode != RESUME || oparg < 2) {
/* Not in a yield from */
return NULL;
}
yf = _PyFrame_StackPeek(frame);
Py_INCREF(yf);
}