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smb2/read: Parse only 1 byte for data_offset, ignore reserved1

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A user provided a SMB2 pcap with the reserved1 field of a ReadResponse
set to 1 instead of 0. This confused the padding computation due to
including this byte into the offset. Properly split data_offset and
reserved1 into individual byte fields.

Closes #4730
This commit is contained in:
Arne Welzel 2025-08-08 15:42:15 +02:00
parent 13f613eb1d
commit b2a2ad7e10
5 changed files with 26 additions and 2 deletions
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9
testing/btest/scripts/base/protocols/smb/smb2-read-response-non-zero-reserved1.test Normal file
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@ -0,0 +1,9 @@
# @TEST-DOC: Regression test for #4730, ReadResponse not parsed properly.
#
# @TEST-EXEC: zeek -b -C -r $TRACES/smb/smb_v2_only_non_zero_reserved1.pcap %INPUT
# @TEST-EXEC: btest-diff files.log
# @TEST-EXEC: test ! -f analyzer.log
# @TEST-EXEC: test ! -f weird.log
@load base/protocols/smb