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MDEV-39219: buffer overflow in PROXY protocol v1 header parsing #4881

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MDEV-39219: buffer overflow in PROXY protocol v1 header parsing #4881

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dd6ecac
Fix buffer overflow in PROXY protocol header parsing
uwezkhan Mar 30, 2026
78b7632
Updated
uwezkhan Apr 1, 2026
aaa9349
fix off-by-one buffer overflow in PROXY header parsing
uwezkhan Apr 1, 2026
85e3746
fix off-by-one buffer overflow in PROXY header parsing
uwezkhan Apr 1, 2026
fed0ac0
Merge branch 'header-overflow' of https://github.com/uwezkhan/server …
uwezkhan Apr 1, 2026
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4 changes: 2 additions & 2 deletions sql/proxy_protocol.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -195,10 +195,10 @@ int parse_proxy_protocol_header(NET *net, proxy_peer_info *peer_info)
if (have_v1_header)
{
/* Read until end of header (newline character)*/
while(pos < sizeof(hdr))
while(pos < sizeof(hdr) - 1)
{
long len= (long)vio_read(vio, hdr + pos, 1);
if (len < 0)
if (len <= 0)
return -1;
pos++;
if (hdr[pos-1] == '\n')
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