From be65e7d9fbd3ae6fc097cedade2afe39805fcf4e Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Sun, 7 May 2006 00:02:53 +0200 Subject: [PATCH] Fix users of prefix_path() to free() only when necessary Unfortunately, prefix_path() sometimes returns a newly xmalloc()ed buffer, and in other cases it returns a substring! For example, when calling git update-index ./hello.txt prefix_path() returns "hello.txt", but does not allocate a new buffer. The original code only checked if the result of prefix_path() was different from what was passed in, and thusly trigger a segmentation fault. Signed-off-by: Johannes Schindelin Signed-off-by: Junio C Hamano --- checkout-index.c | 4 ++-- update-index.c | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/checkout-index.c b/checkout-index.c index 0b9cabc61..cc3a745c1 100644 --- a/checkout-index.c +++ b/checkout-index.c @@ -277,7 +277,7 @@ int main(int argc, char **argv) die("git-checkout-index: don't mix '--stdin' and explicit filenames"); p = prefix_path(prefix, prefix_length, arg); checkout_file(p); - if (p != arg) + if (p < arg || p > arg + strlen(arg)) free((char*)p); } @@ -299,7 +299,7 @@ int main(int argc, char **argv) path_name = buf.buf; p = prefix_path(prefix, prefix_length, path_name); checkout_file(p); - if (p != path_name) + if (p < path_name || p > path_name + strlen(path_name)) free((char *)p); if (path_name != buf.buf) free(path_name); diff --git a/update-index.c b/update-index.c index d63f8ac99..00cde7064 100644 --- a/update-index.c +++ b/update-index.c @@ -382,7 +382,7 @@ static void update_one(const char *path, const char *prefix, int prefix_length) die("Unable to process file %s", path); report("add '%s'", path); free_return: - if (p != path) + if (p < path || p > path + strlen(path)) free((char*)p); } @@ -594,7 +594,7 @@ static int do_unresolve(int ac, const char **av, const char *arg = av[i]; const char *p = prefix_path(prefix, prefix_length, arg); err |= unresolve_one(p); - if (p != arg) + if (p < arg || p > arg + strlen(arg)) free((char*)p); } return err; @@ -750,7 +750,7 @@ int main(int argc, const char **argv) update_one(p, NULL, 0); if (set_executable_bit) chmod_path(set_executable_bit, p); - if (p != path_name) + if (p < path_name || p > path_name + strlen(path_name)) free((char*) p); if (path_name != buf.buf) free(path_name); -- 2.26.2