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Code Issues Releases Wiki Activity

Added upper bound for CRC32C check on mouse cursor pixels

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This commit is contained in:
Bryan Roe
2019-09-21 00:18:29 -07:00
parent 8b08323b04
commit 42a240f43c
1 changed files with 9 additions and 6 deletions
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15
meshcore/KVM/Linux/linux_kvm.c
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@@ -751,15 +751,17 @@ void* kvm_server_mainloop(void* parm)
unsigned short w = ((unsigned short*)(cursor_image + 4))[0];
unsigned short h = ((unsigned short*)(cursor_image + 6))[0];
char *pixels = cursor_image + 24;
char alpha[1024];
char alpha[65535];
int i;
for (i = 0; i < (w*h); ++i)
{
alpha[i] = pixels[7 + (i * 8)];
}
switch (crc32c(0, (unsigned char*)alpha, (uint32_t)(w*h)))
if ((size_t)(w*h) <= sizeof(alpha))
{
for (i = 0; i < (w*h); ++i)
{
alpha[i] = pixels[7 + (i * 8)];
}
switch (crc32c(0, (unsigned char*)alpha, (uint32_t)(w*h)))
{
case 680869104:
curcursor = KVM_MouseCursor_SIZENS;
break;
@@ -780,6 +782,7 @@ void* kvm_server_mainloop(void* parm)
case 728953462:
curcursor = KVM_MouseCursor_ARROW;
break;
}
}
}
}