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Detect sizeofcmds too small

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=66330&q=label%3AProj-upx
	modified:   p_mach.cpp
This commit is contained in:
John Reiser
2024-05-04 10:10:37 -07:00
parent 548227a55b
commit 2ea316d754
1 changed files with 2 additions and 1 deletions
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src/p_mach.cpp
+2 -1
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@@ -1645,7 +1645,8 @@ tribool PackMachBase<T>::canUnpack()
unsigned const ncmds = mhdri.ncmds; unsigned const ncmds = mhdri.ncmds;
int headway = (int)mhdri.sizeofcmds; int headway = (int)mhdri.sizeofcmds;
if (!ncmds || MAX_N_CMDS < ncmds || file_size < headway) { if (!ncmds || MAX_N_CMDS < ncmds || file_size < headway
|| headway < 4*4 ) {
char msg[80]; snprintf(msg, sizeof(msg), char msg[80]; snprintf(msg, sizeof(msg),
"bad Mach_header ncmds=%d sizeofcmds=0x%x", ncmds, headway); "bad Mach_header ncmds=%d sizeofcmds=0x%x", ncmds, headway);
throwCantUnpack(msg); throwCantUnpack(msg);