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authorMichael Vogt <mvo@ubuntu.com>2015-05-22 15:28:53 +0200
committerMichael Vogt <mvo@ubuntu.com>2015-05-22 15:28:53 +0200
commitceafe8a6edc815df2923ba892894617829e9d3c2 (patch)
tree82f8e819f161b7f79d510d51b51b191f12840c8e /doc
parent68be2fbb252a71303046e2ca7866cd659a91b585 (diff)
Fix endless loop in apt-get update that can cause disk fillup
The apt http code parses Content-Length and Content-Range. For both requests the variable "Size" is used and the semantic for this Size is the total file size. However Content-Length is not the entire file size for partital file requests. For servers that send the Content-Range header first and then the Content-Length header this can lead to globbing of Size so that its less than the real file size. This may lead to a subsequent passing of a negative number into the CircleBuf which leads to a endless loop that writes data. Thanks to Anton Blanchard for the analysis and initial patch. LP: #1445239
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