git_mkstemp(): be careful not to overflow the path buffer.

diff --git a/builtin-apply.c b/builtin-apply.c
index f94d0dbf488ff43ccc496939560c81daf05772cf..0a0b4a9e3f6550b6a4729e94242811dcb6e8d09a 100644 (file)
--- a/builtin-apply.c
+++ b/builtin-apply.c
@@ -55,7 +55,7 @@ static enum whitespace_eol {
 } new_whitespace = warn_on_whitespace;
 static int whitespace_error;
 static int squelch_whitespace_errors = 5;
-static int applied_after_stripping;
+static int applied_after_fixing_ws;
 static const char *patch_input_file;
 
 static void parse_whitespace_option(const char *option)
@@ -185,7 +185,7 @@ static void *read_patch_file(int fd, unsigned long *sizep)
        void *buffer = xmalloc(alloc);
 
        for (;;) {
-               int nr = alloc - size;
+               ssize_t nr = alloc - size;
                if (nr < 1024) {
                        alloc += CHUNKSIZE;
                        buffer = xrealloc(buffer, alloc);
@@ -1003,12 +1003,16 @@ static int parse_fragment(char *line, unsigned long size, struct patch *patch, s
                        trailing++;
                        break;
                case '-':
+                       if (apply_in_reverse &&
+                                       new_whitespace != nowarn_whitespace)
+                               check_whitespace(line, len);
                        deleted++;
                        oldlines--;
                        trailing = 0;
                        break;
                case '+':
-                       if (new_whitespace != nowarn_whitespace)
+                       if (!apply_in_reverse &&
+                                       new_whitespace != nowarn_whitespace)
                                check_whitespace(line, len);
                        added++;
                        newlines--;
@@ -1468,7 +1472,7 @@ static int read_old_data(struct stat *st, const char *path, char **buf_p, unsign
                        return error("unable to open %s", path);
                got = 0;
                for (;;) {
-                       int ret = xread(fd, buf + got, size - got);
+                       ssize_t ret = xread(fd, buf + got, size - got);
                        if (ret <= 0)
                                break;
                        got += ret;
@@ -1657,7 +1661,7 @@ static int apply_line(char *output, const char *patch, int plen)
        if (add_nl_to_tail)
                output[plen++] = '\n';
        if (fixed)
-               applied_after_stripping++;
+               applied_after_fixing_ws++;
        return output + plen - buf;
 }
 
@@ -1671,6 +1675,7 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
        char *new = xmalloc(size);
        const char *oldlines, *newlines;
        int oldsize = 0, newsize = 0;
+       int new_blank_lines_at_end = 0;
        unsigned long leading, trailing;
        int pos, lines;
 
@@ -1678,6 +1683,7 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
                char first;
                int len = linelen(patch, size);
                int plen;
+               int added_blank_line = 0;
 
                if (!len)
                        break;
@@ -1699,6 +1705,7 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
                        else if (first == '+')
                                first = '-';
                }
+
                switch (first) {
                case '\n':
                        /* Newer GNU diff, empty context line */
@@ -1716,9 +1723,14 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
                                break;
                /* Fall-through for ' ' */
                case '+':
-                       if (first != '+' || !no_add)
-                               newsize += apply_line(new + newsize, patch,
-                                                     plen);
+                       if (first != '+' || !no_add) {
+                               int added = apply_line(new + newsize, patch,
+                                                      plen);
+                               newsize += added;
+                               if (first == '+' &&
+                                   added == 1 && new[newsize-1] == '\n')
+                                       added_blank_line = 1;
+                       }
                        break;
                case '@': case '\\':
                        /* Ignore it, we already handled it */
@@ -1728,6 +1740,10 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
                                error("invalid start of line: '%c'", first);
                        return -1;
                }
+               if (added_blank_line)
+                       new_blank_lines_at_end++;
+               else
+                       new_blank_lines_at_end = 0;
                patch += len;
                size -= len;
        }
@@ -1770,9 +1786,16 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag, i
                if (match_beginning && offset)
                        offset = -1;
                if (offset >= 0) {
-                       int diff = newsize - oldsize;
-                       unsigned long size = desc->size + diff;
-                       unsigned long alloc = desc->alloc;
+                       int diff;
+                       unsigned long size, alloc;
+
+                       if (new_whitespace == strip_whitespace &&
+                           (desc->size - oldsize - offset == 0)) /* end of file? */
+                               newsize -= new_blank_lines_at_end;
+
+                       diff = newsize - oldsize;
+                       size = desc->size + diff;
+                       alloc = desc->alloc;
 
                        /* Warn if it was necessary to reduce the number
                         * of context lines.
@@ -2009,6 +2032,29 @@ static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *
        return 0;
 }
 
+static int check_to_create_blob(const char *new_name, int ok_if_exists)
+{
+       struct stat nst;
+       if (!lstat(new_name, &nst)) {
+               if (S_ISDIR(nst.st_mode) || ok_if_exists)
+                       return 0;
+               /*
+                * A leading component of new_name might be a symlink
+                * that is going to be removed with this patch, but
+                * still pointing at somewhere that has the path.
+                * In such a case, path "new_name" does not exist as
+                * far as git is concerned.
+                */
+               if (has_symlink_leading_path(new_name, NULL))
+                       return 0;
+
+               return error("%s: already exists in working directory", new_name);
+       }
+       else if ((errno != ENOENT) && (errno != ENOTDIR))
+               return error("%s: %s", new_name, strerror(errno));
+       return 0;
+}
+
 static int check_patch(struct patch *patch, struct patch *prev_patch)
 {
        struct stat st;
@@ -2095,15 +2141,9 @@ static int check_patch(struct patch *patch, struct patch *prev_patch)
                    !ok_if_exists)
                        return error("%s: already exists in index", new_name);
                if (!cached) {
-                       struct stat nst;
-                       if (!lstat(new_name, &nst)) {
-                               if (S_ISDIR(nst.st_mode) || ok_if_exists)
-                                       ; /* ok */
-                               else
-                                       return error("%s: already exists in working directory", new_name);
-                       }
-                       else if ((errno != ENOENT) && (errno != ENOTDIR))
-                               return error("%s: %s", new_name, strerror(errno));
+                       int err = check_to_create_blob(new_name, ok_if_exists);
+                       if (err)
+                               return err;
                }
                if (!patch->new_mode) {
                        if (0 < patch->is_new)
@@ -2848,18 +2888,17 @@ int cmd_apply(int argc, const char **argv, const char *unused_prefix)
                                squelched == 1 ? "" : "s");
                }
                if (new_whitespace == error_on_whitespace)
-                       die("%d line%s add%s trailing whitespaces.",
+                       die("%d line%s add%s whitespace errors.",
                            whitespace_error,
                            whitespace_error == 1 ? "" : "s",
                            whitespace_error == 1 ? "s" : "");
-               if (applied_after_stripping)
+               if (applied_after_fixing_ws)
                        fprintf(stderr, "warning: %d line%s applied after"
-                               " stripping trailing whitespaces.\n",
-                               applied_after_stripping,
-                               applied_after_stripping == 1 ? "" : "s");
+                               " fixing whitespace errors.\n",
+                               applied_after_fixing_ws,
+                               applied_after_fixing_ws == 1 ? "" : "s");
                else if (whitespace_error)
-                       fprintf(stderr, "warning: %d line%s add%s trailing"
-                               " whitespaces.\n",
+                       fprintf(stderr, "warning: %d line%s add%s whitespace errors.\n",
                                whitespace_error,
                                whitespace_error == 1 ? "" : "s",
                                whitespace_error == 1 ? "s" : "");