Fix heap-buffer-overflow in CLUSTER FORGET with invalid node ID length#14417
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moticless merged 1 commit intoredis:unstablefrom Oct 9, 2025
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When CLUSTER FORGET is called with a node ID shorter than 40 bytes, clusterBlacklistExists would read beyond the allocated string buffer because it always read CLUSTER_NAMELEN (40) bytes regardless of the actual string length provided. This fix adds a length parameter to clusterBlacklistExists() to use the actual length of the provided string, preventing the buffer overflow. This issue was discovered and fixed in Valkey PR redis#2108. The same vulnerability exists in Redis and this commit applies the equivalent fix. Co-authored-by: Ran Shidlansik <[email protected]>
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Description
Fix a heap-buffer-overflow vulnerability in the
CLUSTER FORGETcommand when provided with a node ID shorter than the expected 40 bytes.The Issue
When
CLUSTER FORGETis called with a node ID that has a length smaller thanCLUSTER_NAMELEN(40 bytes), theclusterBlacklistExists()function would read beyond the allocated string buffer. This occurs because the function always attempted to read exactly 40 bytes viasdsnewlen(nodeid, CLUSTER_NAMELEN).This primarily impacts memory inspection tools (e.g., AddressSanitizer) and could potentially cause issues in production environments.
Changes
size_t lenparameter toclusterBlacklistExists()to use the actual string lengthCLUSTER FORGETwith an invalid short node ID returns an appropriate error.This PR is based on:
valkey-io/valkey#2108
Co-authored-by: Ran Shidlansik [email protected]