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X11: Fix segfault on malformed INCR response

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The code assumed that at least some data would be received via the INCR
mechanism and that, as a result, the string buffer would be allocated.

Bug found by Clang static analysis.
This commit is contained in:
Camilla Löwy 2022-04-18 23:22:25 +02:00
parent f60547ac80
commit 23e6e8e4b7
2 changed files with 9 additions and 5 deletions
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1
README.md
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@ -290,6 +290,7 @@ information on what to include when reporting a bug.
- [X11] Bugfix: Dynamic loading on NetBSD failed due to soname differences - [X11] Bugfix: Dynamic loading on NetBSD failed due to soname differences
- [X11] Bugfix: Left shift of int constant relied on undefined behavior (#1951) - [X11] Bugfix: Left shift of int constant relied on undefined behavior (#1951)
- [X11] Bugfix: The OSMesa libray was not unloaded on termination - [X11] Bugfix: The OSMesa libray was not unloaded on termination
- [X11] Bugfix: A malformed response during selection transfer could cause a segfault
- [Wayland] Added dynamic loading of all Wayland libraries - [Wayland] Added dynamic loading of all Wayland libraries
- [Wayland] Added support for key names via xkbcommon - [Wayland] Added support for key names via xkbcommon
- [Wayland] Added support for file path drop events (#2040) - [Wayland] Added support for file path drop events (#2040)

3
src/x11_window.c
View File

@ -984,6 +984,8 @@ static const char* getSelectionString(Atom selection)
} }
if (!itemCount) if (!itemCount)
{
if (string)
{ {
if (targets[i] == XA_STRING) if (targets[i] == XA_STRING)
{ {
@ -992,6 +994,7 @@ static const char* getSelectionString(Atom selection)
} }
else else
*selectionString = string; *selectionString = string;
}
break; break;
} }