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archive: fix panic if len(source) < len(m)

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Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)
This commit is contained in:
Johan Euphrosine 2014-05-16 12:47:50 -07:00
parent 3118952e0a
commit 67ce59a806
1 changed files with 4 additions and 0 deletions
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4
archive/archive.go
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@ -47,6 +47,10 @@ func DetectCompression(source []byte) Compression {
Gzip: {0x1F, 0x8B, 0x08},
Xz: {0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00},
} {
if len(source) < len(m) {
utils.Debugf("Len too short")
continue
}
if bytes.Compare(m, source[:len(m)]) == 0 {
return compression
}