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author | Martin Erik Werner <martinerikwerner@gmail.com> | 2014-04-24 17:06:09 +0400 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2014-04-25 00:46:13 +0400 |
commit | 6127ff63cf39471b2c7317c9861016424d3b884b (patch) | |
tree | 19b830120ec820d876730960d6d994ba6a017302 | |
parent | 655ee9ea3e6c0af57d320e84723ec3bf656cdbf7 (diff) |
setup: fix windows path buffer over-stepping
Fix a buffer over-stepping issue triggered by providing an absolute path
that is similar to the work tree path.
abspath_part_inside_repo() may currently increment the path pointer by
offset_1st_component() + wtlen, which is too much, since
offset_1st_component() is a subset of wtlen.
For the *nix-style prefix '/', this does (by luck) not cause any issues,
since offset_1st_component() is 1 and there will always be a '/' or '\0'
that can "absorb" this.
In the case of DOS-style prefixes though, the offset_1st_component() is
3 and this can potentially over-step the string buffer. For example if
work_tree = "c:/r"
path = "c:/rl"
Then wtlen is 4, and incrementing the path pointer by (3 + 4) would
end up 2 bytes outside a string buffer of length 6.
Similarly if
work_tree = "c:/r"
path = "c:/rl/d/a"
Then (since the loop starts by also incrementing the pointer one step),
this would mean that the function would miss checking if "c:/rl/d" could
be the work_tree, arguably this is unlikely though, since it would only
be possible with symlinks on windows.
Fix this by simply avoiding to increment by offset_1st_component() and
wtlen at the same time.
Signed-off-by: Martin Erik Werner <martinerikwerner@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r-- | setup.c | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -29,7 +29,7 @@ static int abspath_part_inside_repo(char *path) return -1; wtlen = strlen(work_tree); len = strlen(path); - off = 0; + off = offset_1st_component(path); /* check if work tree is already the prefix */ if (wtlen <= len && !strncmp(path, work_tree, wtlen)) { @@ -45,7 +45,7 @@ static int abspath_part_inside_repo(char *path) off = wtlen; } path0 = path; - path += offset_1st_component(path) + off; + path += off; /* check each '/'-terminated level */ while (*path) { |