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-rw-r--r--applypatch/bspatch.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/applypatch/bspatch.c b/applypatch/bspatch.c
index 2e80f81..1dc7ab1 100644
--- a/applypatch/bspatch.c
+++ b/applypatch/bspatch.c
@@ -205,6 +205,11 @@ int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
ctrl[1] = offtin(buf+8);
ctrl[2] = offtin(buf+16);
+ if (ctrl[0] < 0 || ctrl[1] < 0) {
+ printf("corrupt patch (negative byte counts)\n");
+ return 1;
+ }
+
// Sanity check
if (newpos + ctrl[0] > *new_size) {
printf("corrupt patch (new file overrun)\n");