Search for a space character only within the current line in
read_commit_extra_header_lines() instead of searching in the whole
buffer (and possibly beyond, if it's not NUL-terminated) and then
discarding any results after the end of the current line.

Signed-off-by: Rene Scharfe <l....@web.de>
---
 commit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/commit.c b/commit.c
index 2cf85158b4..173c6d3818 100644
--- a/commit.c
+++ b/commit.c
@@ -1354,8 +1354,8 @@ static struct commit_extra_header 
*read_commit_extra_header_lines(
                strbuf_reset(&buf);
                it = NULL;
 
-               eof = strchr(line, ' ');
-               if (next <= eof)
+               eof = memchr(line, ' ', next - line);
+               if (!eof)
                        eof = next;
 
                if (standard_header_field(line, eof - line) ||
-- 
2.12.0

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