33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
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From: Kamil Dudka <kdudka@redhat.com>
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Date: Tue, 22 Sep 2015 18:52:23 +0200
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Subject: [PATCH] extract: prevent unsigned overflow on invalid input
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Origin: other, https://bugzilla.redhat.com/attachment.cgi?id=1075942
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Bug-RedHat: https://bugzilla.redhat.com/show_bug.cgi?id=1260944
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Suggested-by: Stefan Cornelius
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---
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extract.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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--- a/extract.c
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+++ b/extract.c
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@@ -1257,8 +1257,17 @@
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if (G.lrec.compression_method == STORED) {
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zusz_t csiz_decrypted = G.lrec.csize;
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- if (G.pInfo->encrypted)
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+ if (G.pInfo->encrypted) {
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+ if (csiz_decrypted < 12) {
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+ /* handle the error now to prevent unsigned overflow */
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+ Info(slide, 0x401, ((char *)slide,
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+ LoadFarStringSmall(ErrUnzipNoFile),
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+ LoadFarString(InvalidComprData),
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+ LoadFarStringSmall2(Inflate)));
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+ return PK_ERR;
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+ }
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csiz_decrypted -= 12;
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+ }
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if (G.lrec.ucsize != csiz_decrypted) {
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Info(slide, 0x401, ((char *)slide,
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LoadFarStringSmall2(WrnStorUCSizCSizDiff),
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