ar: hopefully fix out-of-bounds read in get_header_ar()

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882175

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/archival/libarchive/get_header_ar.c b/archival/libarchive/get_header_ar.c
index 1809ec396..93e071c9f 100644
--- a/archival/libarchive/get_header_ar.c
+++ b/archival/libarchive/get_header_ar.c
@@ -83,7 +83,7 @@ char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
                          */
                         ar_long_name_size = size;
                         free(ar_long_names);
-                        ar_long_names = xmalloc(size);
+                        ar_long_names = xzalloc(size + 1);
                         xread(archive_handle->src_fd, ar_long_names, size);
                         archive_handle->offset += size;
                         /* Return next header */
@@ -107,7 +107,7 @@ char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
                 unsigned long_offset;
 
                 /* The number after the '/' indicates the offset in the ar data section
-                 * (saved in ar_long_names) that conatains the real filename */
+                 * (saved in ar_long_names) that contains the real filename */
                 long_offset = read_num(&ar.formatted.name[1], 10,
                                        sizeof(ar.formatted.name) - 1);
                 if (long_offset >= ar_long_name_size) {