fix(zfile): check gzread returns for truncated or corrupt input - #5372
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The reader ignored gzread()'s return value when reading the header and each scanline, so a truncated or corrupt (gzip) file was processed with whatever happened to be in the buffer. Verify the requested number of bytes was actually read and error out otherwise. Also add a test for the decomression bomb checks that have already been added in a prior PR. Assisted-by: GitHub Copilot / Claude Opus 4.8 Signed-off-by: Larry Gritz <lg@larrygritz.com>
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Straightforward small fix -- check return codes for errors that we neglected to check before. |
brechtvl
approved these changes
Aug 14, 2026
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The reader ignored gzread()'s return value when reading the header and each scanline, so a truncated or corrupt (gzip) file was processed with whatever happened to be in the buffer. Verify the requested number of bytes was actually read and error out otherwise.
Also add a test for the decompression bomb checks that have already been added in a prior PR.
Assisted-by: GitHub Copilot / Claude Opus 4.8