x509asn1: fix operator order in do_pubkey#21533
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Check the range before reading data, as it would otherwise read one byte too many. Reported-by: Andrew Nesbit
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Pull request overview
This PR fixes a potential out-of-bounds read in the X.509 ASN.1 public key parsing logic by reordering a loop condition so the buffer boundary is checked before dereferencing.
Changes:
- Reordered the
forloop condition indo_pubkey()to ensureq < elem.endis evaluated before!*q, preventing reading pastelem.end.
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Check the range before reading data, as it would otherwise read one byte too many. Reported-by: Andrew Nesbit Closes curl#21533
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Check the range before reading data, as it would otherwise read one byte too many.
Reported-by: Andrew Nesbit