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worktree: don't segfault with an absolute pathspec without a work tree

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If a command is run with an absolute path as a pathspec inside a bare
repository, e.g. "rev-list HEAD -- /home", the code tried to run strlen()
on NULL, which is the result of get_git_work_tree(), and segfaulted.  It
should just fail instead.

Currently the function returns NULL even inside .git/ in a repository
with a work tree, but that is a separate issue.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2009-12-16 10:50:09 -08:00
parent 8b8e862490
commit b3100fd555
2 changed files with 20 additions and 2 deletions
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7
setup.c
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@ -18,9 +18,12 @@ const char *prefix_path(const char *prefix, int len, const char *path)
if (normalize_path_copy(sanitized, sanitized))
goto error_out;
if (is_absolute_path(orig)) {
size_t len, total;
const char *work_tree = get_git_work_tree();
size_t len = strlen(work_tree);
size_t total = strlen(sanitized) + 1;
if (!work_tree)
goto error_out;
len = strlen(work_tree);
total = strlen(sanitized) + 1;
if (strncmp(sanitized, work_tree, len) ||
(sanitized[len] != '\0' && sanitized[len] != '/')) {
error_out: