Json read check json size #1709
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swlars
reviewed
Sep 6, 2024
src/iperf_api.c
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| hsize = ntohl(nsize); | ||
| rc = Nread(fd, (char*) &nsize, sizeof(nsize), Ptcp); | ||
| hsize = ntohl(nsize); | ||
| if (rc == sizeof(nsize) && hsize > 0 && hsize <= MAX_PARAMS_JSON_STRING) { |
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Hey David, thank you for the pull request. We like this change, but we would prefer it if the rc check was separate and before we use the value of nsize. If Nread fails, it would be better to just fall through.
if (rc == sizeof(nsize)){
hsize = ntohl(nsize);
if (hsize > 0 && hsize <= MAX_PARAMS_JSON_STRING) {
...
}
}
Also, I realize it's not there now, but adding a print statement else if it fails the size checks would be helpful. Let us know what you think!
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Changes done (hopefully as requested).
davidBar-On
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Perfect! Thanks again for the pull request! |
This was referenced Sep 27, 2024
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Version of iperf3 (or development branch, such as
masteror3.1-STABLE) to which this pull request applies:latest
Issues fixed (if any): None
Brief description of code changes (suitable for use as a commit message):
When receiving Params JSON size, verify that received exactly the
sizeof(<size variable>)bytes.In addition, added a check that the size received is reasonable - positive and is less than 8KB (which probably is much more that needed and may be reduced).