Wire: avoid buffer overflow in arduino::ZephyrI2C::write(uint8_t)

JZimnol · JZimnol · commit bba50c740d98 · 2026-03-25T11:39:18.000+01:00
Signed-off-by: Jakub Zimnol &lt;zimnol.jakub@gmail.com&gt;
diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp
@@ -69,6 +69,9 @@ size_t arduino::ZephyrI2C::requestFrom(uint8_t address, size_t len) { // TODO fo
 }
 
 size_t arduino::ZephyrI2C::write(uint8_t data) {  // TODO for ADS1115
+  if (usedTxBuffer >= sizeof(txBuffer)) {
+    return 0;
+  }
   txBuffer[usedTxBuffer++] = data;
   return 1;
 }

Original file line number	Diff line number	Diff line change
`@@ -69,6 +69,9 @@ size_t arduino::ZephyrI2C::requestFrom(uint8_t address, size_t len) { // TODO fo`
`69`	`69`	`}`
`70`	`70`
`71`	`71`	`size_t arduino::ZephyrI2C::write(uint8_t data) { // TODO for ADS1115`
	`72`	`+ if (usedTxBuffer >= sizeof(txBuffer)) {`
	`73`	`+ return 0;`
	`74`	`+ }`
`72`	`75`	`txBuffer[usedTxBuffer++] = data;`
`73`	`76`	`return 1;`
`74`	`77`	`}`