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| author | apnadkarni <apnmbx-wits@yahoo.com> | 2023-09-05 05:48:57 (GMT) |
|---|---|---|
| committer | apnadkarni <apnmbx-wits@yahoo.com> | 2023-09-05 05:48:57 (GMT) |
| commit | 22f59c102a2c3880b0e8aa0b3cae623411e84b2f (patch) | |
| tree | 35411e4a59dd4e1245b92c6413f5ae03acdd6399 /generic/tclStringObj.c | |
| parent | 38d04b648dd088e9c28b707603b82dcac81411e5 (diff) | |
| download | tcl-22f59c102a2c3880b0e8aa0b3cae623411e84b2f.zip tcl-22f59c102a2c3880b0e8aa0b3cae623411e84b2f.tar.gz tcl-22f59c102a2c3880b0e8aa0b3cae623411e84b2f.tar.bz2 | |
Fix [b5ac3e3786] - Tcl_GetUniChar oob read
Diffstat (limited to 'generic/tclStringObj.c')
| -rw-r--r-- | generic/tclStringObj.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c index b1046b1..975b991 100644 --- a/generic/tclStringObj.c +++ b/generic/tclStringObj.c @@ -575,6 +575,9 @@ Tcl_GetUniChar( if (stringPtr->numChars == -1) { TclNumUtfChars(stringPtr->numChars, objPtr->bytes, objPtr->length); } + if (index >= stringPtr->numChars) { + return 0xFFFD; + } if (stringPtr->numChars == objPtr->length) { return (unsigned char) objPtr->bytes[index]; } @@ -631,7 +634,11 @@ TclGetUCS4( if (stringPtr->numChars == -1) { TclNumUtfChars(stringPtr->numChars, objPtr->bytes, objPtr->length); } + if (index >= stringPtr->numChars) { + return -1; + } if (stringPtr->numChars == objPtr->length) { + /* Pure ascii, can directly index bytes */ return (unsigned char) objPtr->bytes[index]; } FillUnicodeRep(objPtr); |