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Fix buffer-overrun bug in net (#17728) [backport:1.0]

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shirleyquirk 2021-04-16 13:22:51 +01:00 • committed by GitHub
commit fdd4391534
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2 changed files with 5 additions and 4 deletions
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2
changelog.md
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@ -40,6 +40,8 @@
## Standard library additions and changes
- Added support for parenthesized expressions in `strformat`
- Fixed buffer overflow bugs in `net`
- Added `sections` iterator in `parsecfg`.
- Make custom op in macros.quote work for all statements.

7
lib/pure/net.nim
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@ -690,12 +690,11 @@ when defineSsl:
let ctx = SslContext(context: ssl.SSL_get_SSL_CTX)
let hintString = if hint == nil: "" else: $hint
let (identityString, pskString) = (ctx.clientGetPskFunc)(hintString)
if psk.len.cuint > max_psk_len:
if pskString.len.cuint > max_psk_len:
return 0
if identityString.len.cuint >= max_identity_len:
return 0
copyMem(identity, identityString.cstring, pskString.len + 1) # with the last zero byte
copyMem(identity, identityString.cstring, identityString.len + 1) # with the last zero byte
copyMem(psk, pskString.cstring, pskString.len)
return pskString.len.cuint
@ -716,7 +715,7 @@ when defineSsl:
max_psk_len: cint): cuint {.cdecl.} =
let ctx = SslContext(context: ssl.SSL_get_SSL_CTX)
let pskString = (ctx.serverGetPskFunc)($identity)
if psk.len.cint > max_psk_len:
if pskString.len.cint > max_psk_len:
return 0
copyMem(psk, pskString.cstring, pskString.len)