From: Auke Kok Date: Mon, 6 Feb 2017 07:59:18 +0000 (-0800) Subject: Prevent SIGFPE on entity tile loading issue. (#5178) X-Git-Tag: 0.4.16~457 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=3e30731c1ac313b504ff15eb7f40ce6a387d3da2;p=oweals%2Fminetest.git Prevent SIGFPE on entity tile loading issue. (#5178) While experimenting with entities I ran into this unresolvable error where the server is sending some texture that the client crashes on. The crash prevents the client from ever reconnecting, resulting in a server that has to use clearobjects. We shouldn't crash but just ignore the object and move on. ``` 0x00000000004dc0de in TextureSource::generateImagePart (this=this@entry=0x7118eb0, part_of_name="[applyfiltersformesh", baseimg=@0x7fffffffbe98: 0x9f1b010) at /home/sofar/git/minetest/src/client/tile.cpp:1744 1744 u32 xscale = scaleto / dim.Width; (gdb) bt #0 0x00000000004dc0de in TextureSource::generateImagePart (this=this@entry=0x7118eb0, part_of_name="[applyfiltersformesh", baseimg=@0x7fffffffbe98: 0x9f1b010) at /home/sofar/git/minetest/src/client/tile.cpp:1744 ``` After reconnecting, the client now can connect without issues and displays an error message: ``` ERROR[Main]: generateImagePart(): Illegal 0 dimension for part_of_name="[applyfiltersformesh", cancelling. ERROR[Main]: generateImage(): Failed to generate "[applyfiltersformesh" ERROR[Main]: Irrlicht: Invalid size of image for OpenGL Texture. ``` --- diff --git a/src/client/tile.cpp b/src/client/tile.cpp index fbc0f1709..000c766d0 100644 --- a/src/client/tile.cpp +++ b/src/client/tile.cpp @@ -1741,6 +1741,12 @@ bool TextureSource::generateImagePart(std::string part_of_name, * equal to the target minimum. If e.g. this is a vertical frames * animation, the short dimension will be the real size. */ + if ((dim.Width == 0) || (dim.Height == 0)) { + errorstream << "generateImagePart(): Illegal 0 dimension " + << "for part_of_name=\""<< part_of_name + << "\", cancelling." << std::endl; + return false; + } u32 xscale = scaleto / dim.Width; u32 yscale = scaleto / dim.Height; u32 scale = (xscale > yscale) ? xscale : yscale;