emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

unlzma: fix a case where we could read before beginning of buffer

Browse Source 
Testcase:

  21 01 01 00 00 00 00 00 e7 01 01 01 ef 00 df b6
  00 17 02 10 11 0f ff 00 16 00 00

Unfortunately, the bug is not reliably causing a segfault,
the behavior depends on what's in memory before the buffer.

function                                             old     new   delta
unpack_lzma_stream                                  2762    2768      +6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-06-15 15:07:57 +02:00
parent 4d4fc5ca5e
commit 04f052c56d
3 changed files with 17 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
testsuite/unlzma.tests
View File

@@ -8,14 +8,23 @@
# Damaged encrypted streams
testing "unlzma (bad archive 1)" \
"unlzma <unlzma_issue_1.lzma >/dev/null; echo \$?" \
"1
"unlzma <unlzma_issue_1.lzma 2>&1 >/dev/null; echo \$?" \
"unlzma: corrupted data
1
" "" ""
# Damaged encrypted streams
testing "unlzma (bad archive 2)" \
"unlzma <unlzma_issue_2.lzma >/dev/null; echo \$?" \
"1
"unlzma <unlzma_issue_2.lzma 2>&1 >/dev/null; echo \$?" \
"unlzma: corrupted data
1
" "" ""
# Damaged encrypted streams
testing "unlzma (bad archive 3)" \
"unlzma <unlzma_issue_3.lzma 2>&1 >/dev/null; echo \$?" \
"unlzma: corrupted data
1
" "" ""
exit $FAILCOUNT

BIN
testsuite/unlzma_issue_3.lzma Normal file
View File

Binary file not shown.