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odb: don't overflow the link path buffer

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Allocate a buffer large enough to store the path plus the terminator
instead of letting readlink write beyond the end.
This commit is contained in:
Carlos Martín Nieto 2012-09-16 00:10:07 +02:00
parent 1e90ae77c4
commit e8776d30f7
1 changed files with 3 additions and 2 deletions
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src/odb.c
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@ -196,10 +196,11 @@ int git_odb__hashlink(git_oid *out, const char *path)
char *link_data; char *link_data;
ssize_t read_len; ssize_t read_len;
link_data = git__malloc((size_t)size); link_data = git__malloc((size_t)(size + 1));
GITERR_CHECK_ALLOC(link_data); GITERR_CHECK_ALLOC(link_data);
read_len = p_readlink(path, link_data, (size_t)(size + 1)); read_len = p_readlink(path, link_data, (size_t)size);
link_data[size] = '\0';
if (read_len != (ssize_t)size) { if (read_len != (ssize_t)size) {
giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", path); giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", path);
return -1; return -1;