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| author |  Jeff King <peff@peff.net> | 2017-02-14 12:27:45 -0500 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2017-02-14 11:28:53 -0800 |
| commit | d9e557a320bd4695bccad873e176562489b2d199 (patch) | |
| tree | 136c4bfc8528f19fd593f6c83d429b03ed5cfb2f /builtin/show-branch.c | |
| parent | show-branch: drop head_len variable (diff) | |
| download | tgif-d9e557a320bd4695bccad873e176562489b2d199.tar.xz | |
show-branch: store resolved head in heap buffer
We resolve HEAD and copy the result to a fixed-size buffer
with memcpy, never checking that it actually fits. This bug
dates back to 8098a178b (Add git-symbolic-ref, 2005-09-30).
Before that we used readlink(), which took a maximum buffer
size.
We can fix this by using resolve_refdup(), which duplicates
the buffer on the heap. That also lets us just check
for a NULL pointer to see if we have resolved HEAD, and
drop the extra head_p variable.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/show-branch.c')
| -rw-r--r-- | builtin/show-branch.c | 19 |
1 files changed, 5 insertions, 14 deletions
diff --git a/builtin/show-branch.c b/builtin/show-branch.c index f8ce537018..705e492ce6 100644 --- a/builtin/show-branch.c +++ b/builtin/show-branch.c @@ -473,8 +473,7 @@ static void snarf_refs(int head, int remotes) static int rev_is_head(char *head, char *name, unsigned char *head_sha1, unsigned char *sha1) { - if ((!head[0]) || - (head_sha1 && sha1 && hashcmp(head_sha1, sha1))) + if (!head || (head_sha1 && sha1 && hashcmp(head_sha1, sha1))) return 0; if (starts_with(head, "refs/heads/")) head += 11; @@ -621,8 +620,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix) int all_heads = 0, all_remotes = 0; int all_mask, all_revs; enum rev_sort_order sort_order = REV_SORT_IN_GRAPH_ORDER; - char head[128]; - const char *head_p; + char *head; struct object_id head_oid; int merge_base = 0; int independent = 0; @@ -786,17 +784,10 @@ int cmd_show_branch(int ac, const char **av, const char *prefix) snarf_refs(all_heads, all_remotes); } - head_p = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, - head_oid.hash, NULL); - if (head_p) { - size_t head_len = strlen(head_p); - memcpy(head, head_p, head_len + 1); - } - else { - head[0] = 0; - } + head = resolve_refdup("HEAD", RESOLVE_REF_READING, + head_oid.hash, NULL); - if (with_current_branch && head_p) { + if (with_current_branch && head) { int has_head = 0; for (i = 0; !has_head && i < ref_name_cnt; i++) { /* We are only interested in adding the branch |