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bug#25498: Crash in open-file; patch attached
From: |
Linas Vepstas |
Subject: |
bug#25498: Crash in open-file; patch attached |
Date: |
Fri, 20 Jan 2017 18:34:38 -0600 |
The following crashes instantly; I used single-quotes by accident.
(open-file "/tmp/lg" 'w')
Stack:
Enter `,help' for help.
scheme@(guile-user)> (open-file "/tmp/lg" 'w')
Thread 1 "guile" received signal SIGSEGV, Segmentation fault.
scm_i_mode_to_open_flags (address@hidden,
address@hidden,
address@hidden "open-file")
at ../../libguile/fports.c:168
168 switch (*md)
(gdb) bt
#0 scm_i_mode_to_open_flags (address@hidden,
address@hidden,
address@hidden "open-file")
at ../../libguile/fports.c:168
#1 0x00007ffff7b057e9 in scm_open_file_with_encoding (
address@hidden, address@hidden,
guess_encoding=0x4, encoding=0x4) at ../../libguile/fports.c:242
#2 0x00007ffff7b05b83 in scm_i_open_file (filename=0x555555b7fd98,
mode=0x555555ac5660, keyword_args=<optimized out>)
at ../../libguile/fports.c:380
#3 0x00007ffff7b6a221 in vm_debug_engine (thread=0x555555ac5660,
vp=0x555555844f30, registers=0x54aad62357094bc, resume=39)
at ../../libguile/vm-engine.c:760
A patch that seems reasonable to me:
$ git diff
diff --git a/libguile/fports.c b/libguile/fports.c
index 8fa69933d..28e666b6a 100644
--- a/libguile/fports.c
+++ b/libguile/fports.c
@@ -230,6 +230,9 @@ scm_open_file_with_encoding (SCM filename, SCM mode,
unsigned int retries;
char *file;
+ if (SCM_UNLIKELY (!scm_is_string (mode)))
+ scm_wrong_type_arg_msg (FUNC_NAME, 2, mode, "mode to be string");
+
if (SCM_UNLIKELY (!(scm_is_false (encoding) || scm_is_string (encoding))))
scm_wrong_type_arg_msg (FUNC_NAME, 0, encoding,
"encoding to be string or false");
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Linas Vepstas <=