CVE-2025-71113: crypto: af_alg - zero initialize memory allocated via sock_kmalloc

In the Linux kernel, the following vulnerability has been resolved:

crypto: afalg - zero initialize memory allocated via sockkmalloc

Several crypto user API contexts and requests allocated with sockkmalloc() were left uninitialized, relying on callers to set fields explicitly. This resulted in the use of uninitialized data in certain error paths or when new fields are added in the future.

The ACVP patches also contain two user-space interface files: algifkpp.c and algifakcipher.c. These too rely on proper initialization of their context structures.

A particular issue has been observed with the newly added 'inflight' variable introduced in afalgctx by commit:

67b164a871af ("crypto: afalg - Disallow multiple in-flight AIO requests")

Because the context is not memset to zero after allocation, the inflight variable has contained garbage values. As a result, afalgallocareq() has incorrectly returned -EBUSY randomly when the garbage value was interpreted as true:

https://github.com/gregkh/linux/blame/master/crypto/afalg.c#L1209

The check directly tests ctx->inflight without explicitly comparing against true/false. Since inflight is only ever set to true or false later, an uninitialized value has triggered -EBUSY failures. Zero-initializing memory allocated with sockkmalloc() ensures inflight and other fields start in a known state, removing random issues caused by uninitialized data.