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| author | Mike Frysinger | 2009-10-18 01:11:45 -0400 |
|---|---|---|
| committer | Mike Frysinger | 2009-10-18 01:15:36 -0400 |
| commit | 28736c36ca6a73864324296117ce26c9a23066dd (patch) | |
| tree | 932f02ded50c8df7db9a7eea3063c2ed6c841fc1 /shell | |
| parent | 69d9edc6f8387ed0ec4742a5de895b22b3910818 (diff) | |
| download | busybox-28736c36ca6a73864324296117ce26c9a23066dd.zip busybox-28736c36ca6a73864324296117ce26c9a23066dd.tar.gz | |
hush: handle empty execs
Sometimes variable expansions yield empty strings, and if they happen to
be a command someone wants to run like `$foo`, then hush currently
segfaults. So handle `` and $().
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/hush.c | 6 | ||||
| -rw-r--r-- | shell/hush_test/hush-psubst/emptytick.right | 14 | ||||
| -rwxr-xr-x | shell/hush_test/hush-psubst/emptytick.tests | 16 |
3 files changed, 36 insertions, 0 deletions
diff --git a/shell/hush.c b/shell/hush.c index 2d333d7..1d2826d 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -3895,6 +3895,12 @@ static NOINLINE int run_pipe(struct pipe *pi) argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt); } + /* if someone gives us an empty string: ``, $(), ... */ + if (!argv_expanded[0]) { + debug_leave(); + return 0; + } + x = find_builtin(argv_expanded[0]); #if ENABLE_HUSH_FUNCTIONS funcp = NULL; diff --git a/shell/hush_test/hush-psubst/emptytick.right b/shell/hush_test/hush-psubst/emptytick.right new file mode 100644 index 0000000..d4b70c5 --- /dev/null +++ b/shell/hush_test/hush-psubst/emptytick.right @@ -0,0 +1,14 @@ +0 +0 +0 +0 +0 +0 +0 +0 +0 +0 +0 +0 +0 +0 diff --git a/shell/hush_test/hush-psubst/emptytick.tests b/shell/hush_test/hush-psubst/emptytick.tests new file mode 100755 index 0000000..af3a183 --- /dev/null +++ b/shell/hush_test/hush-psubst/emptytick.tests @@ -0,0 +1,16 @@ +true; ``; echo $? +false; ``; echo $? +true; `""`; echo $? +false; `""`; echo $? +true; ` `; echo $? +false; ` `; echo $? + +true; $(); echo $? +false; $(); echo $? +true; $(""); echo $? +false; $(""); echo $? +true; $( ); echo $? +false; $( ); echo $? + +true; exec ''; echo $? +false; exec ''; echo $? |