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pymain_run_file_obj: validate file type before reading #142570

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pymain_run_file_obj: validate file type before reading#142570
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extension-modulesC modules in the Modules dirtype-bugAn unexpected behavior, bug, or error
@nybblista

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@nybblista
nybblista
opened on Dec 11, 2025

pymain_run_file_obj attempts to skip the source first line before verifying that the file is not a directory.

cpython/Modules/main.c

Lines 382 to 401 in 4eab90f

if (skip_source_first_line) {
int ch;
/* Push back first newline so line numbers remain the same */
while ((ch = getc(fp)) != EOF) {
if (ch == '\n') {
(void)ungetc(ch, fp);
break;
}
}
}
struct _Py_stat_struct sb;
if (_Py_fstat_noraise(fileno(fp), &sb) == 0 && S_ISDIR(sb.st_mode)) {
PySys_FormatStderr("%S: %R is a directory, cannot continue\n",
program_name, filename);
fclose(fp);
return 1;
}

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