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authorHeinrich Schuchardt <heinrich.schuchardt@canonical.com>2022-01-29 19:01:07 +0100
committerHeinrich Schuchardt <heinrich.schuchardt@canonical.com>2022-02-05 20:20:01 +0100
commit344f26a7664f0a3f1a4b302e08a408171bdc3ece (patch)
treec945592c15b0fc67394ea7c97803549201446f72
parentc672dd770ee0d9874086543c20a9088124514051 (diff)
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efi_loader: fix device path to text protocol
The printing of a file path node must properly handle: * odd length of the device path node * UTF-16 character only partially contained in device path node * buffer overflow due to very long file path Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
-rw-r--r--lib/efi_loader/efi_device_path_to_text.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/lib/efi_loader/efi_device_path_to_text.c b/lib/efi_loader/efi_device_path_to_text.c
index d8a83c8..97b3d3e 100644
--- a/lib/efi_loader/efi_device_path_to_text.c
+++ b/lib/efi_loader/efi_device_path_to_text.c
@@ -8,6 +8,7 @@
#include <common.h>
#include <blk.h>
#include <efi_loader.h>
+#include <malloc.h>
#define MAC_OUTPUT_LEN 22
#define UNKNOWN_OUTPUT_LEN 23
@@ -292,10 +293,18 @@ static char *dp_media(char *s, struct efi_device_path *dp)
case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
struct efi_device_path_file_path *fp =
(struct efi_device_path_file_path *)dp;
- int slen = (dp->length - sizeof(*dp)) / 2;
- if (slen > MAX_NODE_LEN - 2)
- slen = MAX_NODE_LEN - 2;
- s += sprintf(s, "%-.*ls", slen, fp->str);
+ u16 *buffer;
+ int slen = dp->length - sizeof(*dp);
+
+ /* two bytes for \0, extra byte if dp->length is odd */
+ buffer = calloc(1, slen + 3);
+ if (!buffer) {
+ log_err("Out of memory\n");
+ return s;
+ }
+ memcpy(buffer, fp->str, dp->length - sizeof(*dp));
+ s += snprintf(s, MAX_NODE_LEN - 1, "%ls", buffer);
+ free(buffer);
break;
}
default: