This issue is a security regression. If you are not able to fix this quickly, please revert the change that introduced it.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

FindIt says that this CL (https://pdfium.googlesource.com/pdfium.git/+/0004f29bf6ee3c6060a272c79f14993e92e053c7) might cause it. I wonder if you could take a look.

ClusterFuzz has detected this issue as fixed in range 460866:460935.

Detailed report: https://clusterfuzz.com/testcase?key=6421221236539392

Fuzzer: ifratric_pdf_generic
Job Type: linux_msan_pdfium
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  CompositeRow_Argb2Argb
  CFX_ScanlineCompositor::CompositeRgbBitmapLine
  CFX_DIBitmap::CompositeBitmap
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_pdfium&range=460163:460191
Fixed: https://clusterfuzz.com/revisions?job=linux_msan_pdfium&range=460866:460935

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv97UGU9zOx6J0vEkM-0mzDH1qX-lUI1qNad6kLYzCEGY93TqcJwNNpswfcQjW-iy7xu_QcAZ6-fB76xup_VbS0Xq1-Qlz6fZVMSI2-jBPL390ULbEIwj8Q3MaUr970Z8U5F-fyGOjTb6jcfD9-75ai5zYyNW8lxUuS9sJ3ie-pEB0CFgxQW2_2uwiYVSJTHjGRHWYwxZJhMbY10GRYzdakoYrNosIiRztSLYG50tLytyP8RSLIhzNvKYrSzK7vpRJMKsxR1ex10BWO-AHdTosJEQQqZ4R-G2q1xTlBPmCwZTm0zZ6RWJQr3ZzAQwaI1hyLDE86Pa1t7gE_jS0c3zlPtoYKnRX9WWONoyaPX0mnO3AtTrW7T71_0GKeA_5t5wrCp6W329yB9xBwXnUSDyA7Sm30MvoQ?testcase_id=6421221236539392


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 6421221236539392 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot